That's a bit of an odd question, the ban system is the same as on any other forum, if someone is 'banned' then they can't access the board.
Members who consistantly disrupt the forum or violate our terms of service will receive warnings up to and including a suspension of permanant ban depending on the nature and severity of the problems they are causing.
As Lottie said, it's not something you should be worrying about. As a new member, make sure you've read through our forum rules before posting, and there's no reason you will ever have to be concerned about being banned.