At the moment the account page isn't changeable by you, except to rename machines and stop the auto-renewal of the account. A phone call to Customer Service might sort this out for you as they control all that side of things.
It's free and linked under Useful Links at the top of this page. There's also the online chat option of you prefer.
If it also offers you an email option I advise you not to use that as it's very slow that way.