Installed in Posbit Legacy.. Here are the directions if you are using Posbit Legacy (My VB version: 3.0.8)
Find:
PHP Code:
<br /><a href="member.php?$session[sessionurl]u=$post[userid]"><img src="$avatarurl" alt="<phrase 1="$post[username]">$vbphrase[xs_avatar]</phrase>" border="0" /></a>
</div>
</if>
ADD DIRECTLY UNDER:
PHP Code:
<if condition="$avatarurl == null"><a href="member.php?$session[sessionurl]u=$post[userid]"><img src="http://www.LINK TO YOUR IMAGE.gif" border="0" /></a></if>
Notice the removal of the <td> tags from the original post.