[mashby]

Take a look at this template mod [link. It may give you more of what you're looking for

But, to answer your question, search in your postbit for:

<normalfont><b>$post[username]</b></normalfont><br>

and replace it with this:

<normalfont>
<a href="member.php?s=$session=&action=getinfo&userid=$post[userid]">
<b>$post[username]</b>
</a>
</normalfont><br>

FYI: this code can be found in your postbit_profile template