From there, expand the "Settings & Privacy" option and tap "Settings." Choose the "Password and Security" from the Account section. Scroll down to the Login section and tap "Change Password." Enter your current password and then your new password twice. Click "Update Password" and your new Facebook password will be saved.

A pop-up window will open with a secure login screen for your Gmail account. Click on the account you signed up with. On the next screen, type your Google password, and then click the "Next" button. Type the new Facebook password you want to use, and then click the "Continue" button.