If you were already registered on the old site then you will be automatically registered on the new one as well. Use the same email to login and just click "Forgot Your Password". You will be sent an email that allows you to reset your password so you can login.
If you had not yet registered on the old site you will follow very similar instructions to register for the new site.
Here is a video showing you how to do it.
If you have problems or questions please email email@example.com and a ticket will be automatically created for you. Be sure to include your serial number and a phone number in case we need to contact you by phone.