Did you register and then wait patiently for the email confirmation from the forum? And then it never arrived?
Chances are good it got caught in your spam filter. If you're an Earthlink user, chances are really good that it's going to get trapped there. Before you keep asking the forum for a new password, go take a look in your messages marked as spam.
If you still can't find it, drop one of the administrators here an email and we'll swap your registration status over to "registered".
BMW MOA Forum Team