how to install css code?

I've tried to put css code, but until now never works,....

after click submit
I am so confused, what should I do now
I'm just confused with the css option
how to css code the results could appear in my forum
who was an obstacle for me to make my forum is becoming increasingly attractive,.....
Please help,....

Well, you need to know what are you adding mate.

Hi, adding CSS codes is not that difficult. As Matti said, you'll need to do know what you're doing. We can help you by providing CSS codes that you need to make some changes on your forum. Is there anything in particular to you're trying to change or make?

I want to change the buttons like (+), but I do not understand what should I do after I insert the css code,....
because I do not understand the intent of the css option, I try not to use css option but to no avail. I am some what less in the setting before I put the css code, css option when I use my forum theme must be changed ....
please his guidance, I really do not understand this css code,...

Hi,

Can I see the code you are using for that?

Are you using this tutorial or
http://www.diondesigns.org/t1338-example-10-a-professional-looking-like-dislike-bar-phpbb3-invision-punbb

what could be for phpBB2, I already changed the theme, because if the sentence marque certainly small in size, ...

That tutorial is not avilable for phpBB2. You can play arround with this for your version https://help.forumotion.com/t48922-change-the-reputation-bar