Cher:
As has been stated in this thread and in the templates.html file that comes with the download you will need to edit your postbit or postbit_legacy templates so this shows up under a member's username with something like.
Code:
<if condition="$post['userid']">
<div>itrader score: <strong><a href="itrader.php?$session[sessionurl]u=$post[userid]">$post[itrader_total]</a> </strong></if>
Play around with the code to make it fit your board.
Parker