How do I get the ad working?

[somebody]

I'm using Simple Machines Forum 1.1.6 .
I have a AdBrite account and I have their code.

<!-- Begin: AdBrite, Generated: 2008-10-27 19:44:36  -->
<style type="text/css">
   .adHeadline {font: bold 10pt Arial; text-decoration: underline; color: #0000FF;}
   .adText {font: normal 10pt Arial; text-decoration: none; color: #000000;}
</style>
<script type="text/javascript">
try{var AdBrite_Iframe=window.top!=window.self?2:1;var AdBrite_Referrer=document.referrer==''?document.location:document.referrer;AdBrite_Referrer=encodeURIComponent(AdBrite_Referrer);}catch(e){var AdBrite_Iframe='';var AdBrite_Referrer='';}
document.write(String.fromCharCode(60,83,67,82,73,80,84));document.write(' src="http://ads.adbrite.com/mb/text_group.php?sid=902002&br=1&dk=776569676874206c6f73735f355f325f776562&col=3&ifr='+AdBrite_Iframe+'&ref='+AdBrite_Referrer+'" type="text/javascript">');document.write(String.fromCharCode(60,47,83,67,82,73,80,84,62));</script>
<div><a class="adHeadline" target="_top" href="http://www.adbrite.com/mb/commerce/purchase_form.php?opid=902002&afsid=1">Your Ad Here</a></div>
<!-- End: AdBrite -->

How exactly do I make it show up on my forum?
Sorry for the noob question.
-Nick