You only need to register once using the form on the left. Once you have registered and been approved, an email will have been sent to you with a link to set you password.
If you have already registered and do not remember your password, or cannot find the email you can simply use the “Lost Password” link at the very bottom of this form and a new email will be sent to you where you can set your password. Be sure to check your junk folder if you do not see it.