You can change your password if you know your current password. You do not have to be enrolled to use this option.
You must enroll into this system before you can use it to reset your password or unlock your account.
For Reset and Unlock
You will need to reset your password if you have forgotten it. You must be enrolled to use this option.
A forgotten password
You will need to unlock your account if you entered the wrong password too many times. You must be enrolled to use this option.