[Creed]

You can add xfire info to their profile using this:
(remember to replace fieldx with the field number you created for xfire usernames)

In MEMBERINFO template find:
<if condition="$vboptions['usereferrer']">

Add above:
<!-- [Xfire Hack ] -->
<if condition="$userinfo['fieldx']">
<fieldset class="fieldset">
				<legend>xFire Info</legend>
<div class="fieldset">
				<div style="padding:$stylevar[formspacer]px">
<a href="http://profile.xfire.com/$userinfo[fieldx]"><img src="http://miniprofile.xfire.com/$userinfo[fieldx].png" border="0"></a>
					
				</div>
			</div>
</fieldset>
</if>
<!-- [end Xfire Hack ] -->

Demo