It's pretty well defined in the template. Did you try rearranging it yourself?
Default (this shows username, usertitle, rank, avatar in order):
HTML Code:
<div id="postmenu_$post[postid]">
<if condition="$show['profile']">
<a class="bigusername" href="member.php?$session[sessionurl]u=$post[userid]">$post[musername]</a>
<script type="text/javascript"> vbmenu_register("postmenu_$post[postid]", true); </script>
<else />
$post[musername]
</if>
</div>
<if condition="$post['usertitle']"><div class="smallfont">$post[usertitle]</div></if>
<if condition="$post['rank']"><div class="smallfont">$post[rank]</div></if>
$template_hook[postbit_userinfo_left]
<if condition="$show['avatar']">
<div class="smallfont">
<br /><a href="member.php?$session[sessionurl]u=$post[userid]"><img src="$post[avatarurl]" $post[avwidth] $post[avheight] alt="<phrase 1="$post[username]">$vbphrase[xs_avatar]</phrase>" border="0" /></a>
</div>
</if>
Try:
HTML Code:
<if condition="$post['usertitle']"><div class="smallfont">$post[usertitle]</div></if>
<if condition="$post['rank']"><div class="smallfont">$post[rank]</div></if>
$template_hook[postbit_userinfo_left]
<if condition="$show['avatar']">
<div class="smallfont">
<br /><a href="member.php?$session[sessionurl]u=$post[userid]"><img src="$post[avatarurl]" $post[avwidth] $post[avheight] alt="<phrase 1="$post[username]">$vbphrase[xs_avatar]</phrase>" border="0" /></a>
</div>
</if>
<div id="postmenu_$post[postid]">
<if condition="$show['profile']">
<a class="bigusername" href="member.php?$session[sessionurl]u=$post[userid]">$post[musername]</a>
<script type="text/javascript"> vbmenu_register("postmenu_$post[postid]", true); </script>
<else />
$post[musername]
</if>
</div>