Also, after you reach four hours time on the forum it can take up to 10 minutes for the change to Jr Member to happen.
There is a link to a whitelist request thread in the
Newbie Guide. You can always post their to become a Jr Member sooner.
Though by the time they respond you will likely have already became one automatically.
I'm considering posting in the whitelist myself, I should be able to demonstrate BTC knowledge above that of the regular newbie.