Log in and click My Account on your subscription page. Your account has two tabs: Password and Your Details.
Click the Your Details tab. The Contact Details section has three fields:
Edit any field and click Save Details. Your changes take effect immediately.
To remove a contact method, clear the field and click Save Details. Messages to that channel will no longer be sent until you add a number or address again.
Use the Forgot password? link on the login page. A reset code will be sent to your registered email or mobile number. Enter the code on the reset page, then set a new password.