Also, I don't see a reference in the instructions for the stuff you need to add to the admin CP.
Finally - I believe you are missing a closing curly brace for the top block you are adding in forumdisplay.php:
PHP Code:
if (!$uignorechk[$thread['postuserid']] || ($uignorechk[$thread['postuserid']] && ($bbuserinfo['usergroupid'] == 6 || $bbuserinfo['userid'] == $thread['postuserid']))) {