Coding HELP

Working with wordpress plugin

Register Plus

My site is set up so a user who registers can be referred by another user. The referral code/invitation code is databased in

wp_users-> user_activation_key

When a user is on his or her status page i would like to display every person they have referred for them on the page.

Example:if userA referred userX and userV then on userA’s status page he would be able to see both of those users. I dont know the proper way to do this with wordpress sql.

<ul class="sidebar" style="margin:0 0 10px 0;">
<li class="referral">
<h2 class="widgettitle"><?php _e('Recent Shows Updated'); ?></h2>
<ul>
       <?php global $wpdb, $current_user;
     	get_currentuserinfo();
        $userref = get_userdata($userrefs=>user_activation_key);
        foreach($userref as $current_user->user_login)?>
<li style="background:#ffffe5;"><?php echo $userref; ?></li>
</ul>
       <?php endforeach; ?>

</li></ul></div>