Before you re-register, please check our re-registration guide as you may not need to register again.
If you do re-register you must not attempt to log in until you receive your new details. For your security re-registering cancels your existing log in details so if you use them your account will be locked. This also invalidates the new details that are on the way to you in the post.
It's important that you both register your joint account separately and receive your own log in details, to view
accounts held in your name. Your customer number and passnumber should never be shared.