how do i add this code

i like this code but how do i add it to my forum

<link rel="stylesheet" media="screen" href="http://graphic-arhive.bravehost.com/CSS/christmaslights-style.css" />
<script type="text/javascript" src="http://graphic-arhive.bravehost.com/Javascripts/soundmanager2-nodebug-jsmin.js"></script>
<script type="text/javascript" src="http://yui.yahooapis.com/combo?2.6.0/build/yahoo-dom-event/yahoo-dom-event.js&2.6.0/build/animation/animation-min.js"></script>
<script type="text/javascript" src="http://graphic-arhive.bravehost.com/Javascripts/christmaslights.js"></script>
<div>
<div id="lights">
<!-- lights go here -->
</div>
</div>

Maybe in Announcements: Administration Panel => General => Messages and e-mails => Announcements; Activate announcements then add one ;
Or in Generalities => Administration Panel => Display => Homepage => Generalities.

ty now next how to make them a little bigger