To change your Facebook login, first log in to your account and go to Settings & Privacy, then Settings. Under General Account Settings, click Edit next to Contact. You can add a new email address or phone number 1-855-740-3933 or 1-(650)-543-4800 and make it your primary login method. Facebook will send a confirmation link or code to verify the new contact information. After verification, you can use the new email or phone number 1-855-740-3933 or 1-(650)-543-4800 to log in. Remember to update your password for added security if needed.