Strange, I never saw "account has not yet been approved". Probably it's somehow related to hack of bitcointalk which happened few years ago. But then you would get message that your account was locked.
Anyway, if you want to contact Admins, try to PM Cyrus or theymos:
theymos:
https://bitcointalk.org/index.php?action=profile;u=35Cyrus:
https://bitcointalk.org/index.php?action=profile;u=78147But before, maybe try to contact one of the global moderators, maybe they will say what exactly you need to do to get your account back.