Log in as the supervisor from the control panel.
For details on how to log in, see Administrator Login Method.
Press [System Settings].
Press [Administrator Tools].
Press [Program / Change Administrator].
Press [Change] for the administrator you want to reset.
Press [Change] for "Login Password".
Enter the login password, and then press [OK].
Enter the login password for confirmation again, and then press [OK].
Press [OK] twice.
You will be automatically logged out.
The supervisor can change the administrators' login passwords but not their login user names.