Hey, guys.
I recently tried this amazing tutorial, but something got wrong.
In my trial forum everything was ok, but when I put it in my actual forum the arrows were gone and didn't work.

My forum: http://teenobsession.forumotion.com/
Version: phpbb2

I'll be very thankful if you can help me.

Where on your forum is this menu?

It's on the top, above the header.

You mean these:

Home
Tutorials
Resources
About Us
Advertise
Submit
Contact Us
More

Yes, exactly.

Please post the codes you are using.

CSS

Code:

    ul.topnav {
      position: absolute;
      top: 0%;
      list-style: none;
      padding: 0 20px;
      margin: 0;
      width: 100%;
      background: #222;
      font-size: 1.2em;
      background: url(http://i43.servimg.com/u/f43/14/73/12/96/topnav10.gif) repeat-x;
    }
    ul.topnav li {
      float: left;
      margin: 0;
      padding: 0 15px 0 0;
      position: relative; /*--Declare X and Y axis base--*/
    }
    ul.topnav li a{
      padding: 10px 5px;
      color: #fff;
      display: block;
      text-decoration: none;
      float: left;
    }
    ul.topnav li a:hover{
      background: url(http://i43.servimg.com/u/f43/14/73/12/96/topnav11.gif) no-repeat center top;
    }
    ul.topnav li span { /*--Drop down trigger styles--*/
      width: 17px;
      height: 35px;
      float: left;
      background: url(http://i43.servimg.com/u/f43/14/73/12/96/subnav10.gif) no-repeat center top;
    }
    ul.topnav li span.subhover {background-position: center bottom; cursor: pointer;}

    /*--Hover effect for trigger--*/
    ul.topnav li ul.subnav {
      list-style: none;
      position: absolute;
      left: 0; top: 35px;
      background: #333;
      margin: 0; padding: 0;
      display: none;
      float: left;
      width: 170px;
      -webkit-border-bottom-right-radius: 05px;
      -webkit-border-bottom-left-radius: 5px;
      -moz-border-radius-bottomright: 05px;
      -moz-border-radius-bottomleft: 5px;
      border-bottom-right-radius: 05px;
      border-bottom-left-radius: 5px;
      border: 1px solid #111;
    }
    ul.topnav li ul.subnav li{
      margin: 0; padding: 0;
      border-top: 1px solid #252525;
      border-bottom: 1px solid #444;
      clear: both;
      width: 170px;
      -webkit-border-bottom-right-radius: 05px;
      -webkit-border-bottom-left-radius: 5px;
      -moz-border-radius-bottomright: 05px;
      -moz-border-radius-bottomleft: 5px;
      border-bottom-right-radius: 05px;
      border-bottom-left-radius: 5px;
    }
    html ul.topnav li ul.subnav li a {
      float: left;
      width: 145px;
      background: #333 url(http://i43.servimg.com/u/f43/14/73/12/96/dropdo10.gif) no-repeat 10px center;
      padding-left: 20px;
    }
    html ul.topnav li ul.subnav li a:hover { /*--Hover effect for subnav links--*/
      background: #222 url(http://i43.servimg.com/u/f43/14/73/12/96/dropdo10.gif) no-repeat 10px center;
    }

templates

Code:


 <script type="text/javascript" src="http://near-reality123123123.webs.com/bar.js"></script>
      <ul class="topnav">
                <li><a href="#">Home</a></li>
                <li>
                    <a href="#">Tutorials</a>

                    <ul class="subnav">
                        <li><a href="#">Sub Nav Link</a></li>
                        <li><a href="#">Sub Nav Link</a></li>
                        <li><a href="#">Sub Nav Link</a></li>
                        <li><a href="#">Sub Nav Link</a></li>
                        <li><a href="#">Sub Nav Link</a></li>

                    </ul>
                </li>
                <li>
                    <a href="#">Resources</a>
                    <ul class="subnav">
                        <li><a href="#">Sub Nav Link</a></li>
                        <li><a href="#">Sub Nav Link</a></li>

                        <li><a href="#">Sub Nav Link</a></li>
                        <li><a href="#">Sub Nav Link</a></li>
                        <li><a href="#">Sub Nav Link</a></li>
                        <li><a href="#">Sub Nav Link</a></li>
                    </ul>
                </li>
                <li><a href="#">About Us</a></li>

                <li><a href="#">Advertise</a></li>
                <li><a href="#">Submit</a></li>
                <li><a href="#">Contact Us</a></li>

                <li>
                    <a href="#">More</a>
                    <ul class="subnav">
                        <li><a href="#">Follow Us on Twitter</a></li>
                        <li><a href="#">Like Us on Facebook</a></li>
                        <li><a href="#">Subscribe on Youtube</a></li>
                    </ul>
                </li>

            </ul> 

I mean the code with your information added to it.

Code:

<script type="text/javascript" src="http://near-reality123123123.webs.com/bar.js"></script>
                          <div><ul class="topnav">
                    <li><a href="#">Êîíêóðñè çà êíèãè</a>
                            <ul class="subnav">
                            <li><a href="http://teenobsession.forumotion.com/t4704-topic">Ñïå÷åëåòå "Äÿâîë÷å"</a></li>
                            <li><a href="#">Ñïå÷åëåòå "Ñêàðëåò"</a></li>
                      </ul></li>
                    <li>
                        <a href="#">Êîíêóðñè çà òâîð÷åñòâî</a>
                        <ul class="subnav">
                            <li><a href="http://teenobsession.forumotion.com/t4710-topic">Ïàíàèð íà âúîáðàæåíèåòî vol. 1</a></li>
                          </ul>
                    </li>
                    <li>
                        <a href="#">Ëè÷íî òâîð÷åñòâî</a>
                        <ul class="subnav">
                            <li><a href="http://teenobsession.forumotion.com/f50-forum">Àç, ðåïîðòåðúò</a></li>
                            <li><a href="http://teenobsession.forumotion.com/f68-forum">Ðîìàíè</a></li>
                            <li><a href="http://teenobsession.forumotion.com/f27-forum">Ñòèõîòâîðåíèÿ</a></li>
                            <li><a href="http://teenobsession.forumotion.com/f26-forum">Ðàçêàçè/ Ôåí Ôèê</a></li>
                            <li><a href="http://teenobsession.forumotion.com/f28-forum">Ðèñóíêè/Ãðàôèêè</a></li>
                            <li><a href="http://teenobsession.forumotion.com/f25-forum">Ôîòîãðàôèÿ/<br>Âèäåîêëèïîâå</a></li>
                            <li><a href="http://teenobsession.forumotion.com/f120-forum">Ñúâåòè è óðîöè</a></li>
                        </ul>
                    </li>
                    <li><a href="#">Êàíäèäàòñòâàé çà</a>
                            <ul class="subnav">
                            <li><a href="http://teenobsession.forumotion.com/t3759-topic">Ìîäåðàòîð</a></li>
                            <li><a href="http://teenobsession.forumotion.com/t4075-topic">Ïðåâîäà÷</a></li>
                            <li><a href="http://teenobsession.forumotion.com/t885-topic">Ðåäàêòîð</a></li>
                            </ul></li>
                    <li><a href="#">Ðîóëïëåé</a>
                            <ul class="subnav">
                            <li><a href="http://teenobsession.forumotion.com/f29-forum">Ñâîáîäåí ðîóïëåé</a></li>
                            <li><a href="http://teenobsession.forumotion.com/f161-forum">Òåìàòè÷åí ðîóïëåé</a></li>
                            </ul></li>
                          <li><a href="#">Ñâúðæåòå ñå ñ íàñ</a>
                            <ul class="subnav">
                            <li><a href="https://www.facebook.com/teen.obsessions.9">Facebook</a></li>
                            <li><a href="https://twitter.com/#!/Teen_Obsession">Twitter</a></li>
                            <li><a href="skype:teen_obsession">Skype</a></li>
                            <li><a href="mailto:teen_obsession@abv.bg">Email</a></li>
                            <li><a href="http://teenobsessionforum.wordpress.com/">Blog</a></li>
                            </ul></li>
                    <li>
                        <a href="#">Îùå</a>
                        <ul class="subnav">
                            <li><a href="#">Ïðèÿòåëè</a></li>
                            <li><a href="http://teenobsession.forumotion.com/t2572-topic">Ïðàâèëà</a></li>
                          <li><a href="#">Èçäàòåëñòâà</a></li>
                            <li></li>
                        </ul>
                    </li>
                </ul>
  </div>

I have resolved it by myself. Just have to put one of the codes in homepage message.
Thanks for the attention and sorry for loosing your time.

It's solved.