[Spangle]

You need to find these lines :

<span class="usertitle">
{vb:raw post.usertitle}
</span>
<vb:if condition="$post['rank']">
<span class="rank">{vb:raw post.rank}</span>
</vb:if>

and move them below the avatar :

<a class="postuseravatar" href="{vb:link member, {vb:raw post}}" title="{vb:rawphrase {vb:raw post['onlinestatusphrase']}, {vb:raw post.username}}">
<img src="{vb:raw post.avatarurl}" alt="{vb:rawphrase xs_avatar, {vb:raw post.username}}" title="{vb:rawphrase xs_avatar, {vb:raw post.username}}" />
</a>

I think !! that will work, you may need to experiment a bit