The rule that got you was probably this one;
1. You must be a member in good standing for at least 30 days and have 25 MEANINGFUL posts in the other discussion forums. In other words, "+1", emoticons etc. without a discernable statement involved do not apply. Postings in the Gun Show Forum, with the exception of the Feedback subforum, do not add to post count.
Settle in, and join some of the discussions. You'll meet the requirements before you know it.