If you read around, there's already a lot of information that addresses your question, but..
At Asta, posts, per se, do not count for posting. It is the quality of the post (ie length, number of words). For each post, depending on its quality, you will receive Hosting Credits. So if you post 30 one liners, you might only be up to about 20 Hosting Credits, but if you post 3 or 4 long, detailed tutorials or information as such you will get more credits. Once you have reached 10 credits, you can apply for a 50mb hosting package, or you can wait until you have 30 credits and apply for the one with 150mb. Once you are hosted, on the main front page of the forums where your credits are displayed, there credits will be gone but it'll say something like "Number of days for hosting". Next to that will be a number.. and when the number gets down to zero you're no longer posted. Obviously, keep the number up by contributing to the boards.
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you saved me up on another long and winding explanation 
