You can update your info by going to Settings, then scroll down and tap Edit profile. Or, tap here to get there directly.
You can update your email, password, phone number, and mail address there (no P.O. boxes or commercial addresses).
If you’re trying to login, but don't know your password, check out the article How do I reset my password?
Will I receive a notification if my account information changes?
Yes. Anytime you make a change to your account, you’ll receive an email with any verification steps in order to complete the change and a confirmation message.