Forums are open to new registrations... for now. I cannot promise that it will stay that way all the time but for now - tell your friends!
As per usual, we ask a few questions to verify that pending members are real people and not bots, that they are genuine people and not here for nefarious reasons. So fill in as much info as you find appropriate and verify your email address within 7 days. Without these things, the administrator will not be able to approve the membership account.