I made my fifth post a few days ago but I still cant post on the normal forums.. Is there an additional step that I have missed?
Yes. From the NEWBIE README post that is pinned to the top of the Newbie sub-forum:
https://bitcointalksearch.org/topic/newbie-readme-177133
That's 4 hours of actively using the site. It isn't enough to just be logged in. If too much time elapses without clicking any links, or submitting any posts/comments, then your active use timer stops until you interact with the site again.
There is other useful information in the NEWBIE README post as well. A great way to get through the 2 hours you have remaining (you're currently at 2 hours 12 minutes) would be to read that full post and follow each of the links found there.