[ZombieAndy]

in the postbit (or postbit legacy depending which you use) template find:

<if condition="$show['avatar']">
				<div class="smallfont">
					&nbsp;<br /><a href="member.php?$session[sessionurl]u=$post[userid]"><img src="$post[avatarurl]" alt="<phrase 1="$post[username]">$vbphrase[xs_avatar]</phrase>" border="0" /></a>
				</div>
			</if>

and below it add:

<if condition="$post['usergroupid']==6"><div class="smallfont"><b>Administrator</b></div></if> 
                          <if condition="$post['usergroupid']==5"><div class="smallfont"><b>Super Moderator</b></div></if> 
                          <if condition="$post['usergroupid']==7"><div class="smallfont"><b>Moderator</b></div></if> 
                          <if condition="$post['usergroupid']==8"><div class="smallfont"><b>Banned</b></div></if>
                          <if condition="$post['usergroupid']==2"><div class="smallfont"><b>Member</b></div></if>

changing the user group ID's to match your own. you'll find them in the usergroup manager.