You can change your email or password from your phone. There is no way to change this information from the website at this time.
If you know your current email/password and simply want to change it, please follow the directions below.
Open Key Ring (make sure you are signed in) > Open the app Menu > 'Account' > 'Change Email' or 'Change Password'.
If you have more than one device, make sure you sign out of your account on all of them and sign back in.