Ja, in "includes/functions.php" nach dieser Zeile suchen und ändern:
$user_name_link = ($image_row['user_id'] != GUEST) ? "<a href=\"".$site_sess->url(ROOT_PATH."member.php?action=showprofile&".URL_USER_ID."=".$image_row['user_id'])."\">".$user_name."</a>" : $user_name;
Gruß Jan