TFP may already seem like an old friend, but you've only been a member for 4 months according to your signup date
There are a number of factors which go into getting access to Tilted Exhibition. We don't give access to just anyone, due to the nature of that forum. At your current rate of 0.84 posts per day, you will be up for review sometime around June. We use post count to identify people who have participated in the forum for awhile, and then a moderator reviews those posts to make sure they're not all a bunch of one-liners.
Short answer: if you want access sooner, participate more.