Those privileges are largely based on post count. I'd thought 5 was the threshhold, but it might be 10.
That said, a good way to boost your post count, work on your critical listening skills, and give back to the community is to post in the mp3 clinic.
Lots of folks of varying skill levels and genres put their mixes there, and they need feedback from folks of all skill levels and experience too.
(Honestly, this thread should probably be in the clinic too)