Due to heavy spamming of forums registration is going in stages.
If you wish to register as a new user with ArchBang Forums, first register and then send an e-mail to: archbangforums at gmail dot com. It should contain the problem you want to discuss or some other AB related content. You will be promoted from registering member with no posting rights to new member with posting rights after that. If your mail is ignored you haven't fulfilled the requirements.