In the postbit template, add
<div>Style:
<if condition="$post['styleid']==#"><a href="http://www.yourforums.com/forum/index.php?styleid=#">your default style</a>
<else />
<if condition="$post['styleid']==#"><a href="http://www.yourforums.com/forum/index.php?styleid=#">Alternative style</a>
<else />
<if condition="$post['styleid']==#"><a href="http://www.yourforums.com/forum/index.php?styleid=#">Alternative style</a>
<else />
<a href="http://www.yourforums.com/forum/index.php?styleid=#">your default style</a>
</if>
</if>
</if>
</if>
</div>
wherever you want it to appear, i have it underneath the members age, so it would go underneath
<if condition="$post['age']"><div>$vbphrase[age]: $post[age]</div></if>
obviously, you need to change the URL to your own forums and the #'s to the corresponding style ID's.
done :)