hello you can see here
www.phdvbulletin.com and choose coolex style and see if you want that, if so go to HEADER template and find:
PHP Code:
<!--change your logo text here-->
<td><div align="center" id="forumname"><a href="$vboptions[forumhome].php$session[sessionurl_q]">
After put:
PHP Code:
<img src="http://www.yoursite.com/yourimage.gif" border=0 width=219 height=45>
where you have the name of forum.
Note you can change the size of image. Regards