Some forums (Criminal History, HESI, a few others) are moderated forums. In moderated forums, all posts are reviewed before being published--and this would apply to anyone posting in those forums. So if you were posting in a moderated forum, you would be getting the "awaiting approval" message.
However, if you are getting that message regardless of wherever you are posting, you need to talk to one of the Admins about that. You can start a thread in the Help Desk and ask for assistance.