Yes, the code
Code:
<a href="$vboptions[forumhome].php$session[sessionurl_q]"><img src="$stylevar[titleimage]" border="0" alt="$vboptions[bbtitle]" /></a>
refers to the logo in the header and makes it a link. You can remove either all of this, or the image section, or move it around a bit.
Basically as long as you don't touch the two lines highlighted earlier then you can do what you want with it in html.