If you wish to update your password, open either the app or web version and head to the login page. Once you have logged in, tap on Settings and Password. Proceed to update your Password.
If you wish to update your email, head to the login page. Tap on Settings and Email. Proceed to update your Email. You will need to enter the verification code you'll receive in your new email address.
If the problem persists, let us know! Get in touch with us and describe your issue in as much detail as possible, so we can look into things.