Actually, it's there on mine now, so you may not have completed your founders pack purchase. You should receive an email stating that you need to apply the founders pack to your account and it'll have you click a link. Once you've done that, you'll see the pack applied to your account here -…
It's not actually there, maybe they redesigned the forum template and forgot to include it or something, but per the first post in this topic it's here - http://nw-forum.perfectworld.com/profile.php?do=editusergroups
Same here, they haven't officially said it was resolved though. Guess we'll just have to wait until it's official so we don't get our hopes up when we actually get on.