Click the "Join" link on the front page to start the registration ... after a few steps (you will have to find out yourself), you will get to a screen that tells you that registration is complete and you will have to wait for an admin to process your account.
That wouldn't help you at all, since you receive your password only via email.
The "no free email" rule is tied to the "one character per person" rule and helps enforce it. Since everyone can make hundreds of free yahoo or hotmail (or similar) addresses, we completely reject free addresses and require you to use a non-free address (e.g. ISP, work or school address) to sign up.
If you don't agree to the terms, don't join. I don't see why you would want to in the first place under such circumstances. This is a standard joining procedure so you should have enough information by now to make your decision.