Canon LBP7780CX User Manual page 642

6
Set a new administrator password.
(1) Select the [Set/Change Password] check box.
(2) Enter the administrator password.
(3) Click [OK].
[Set/Change Password]
[Password]
[Confirm]
Select the check box when setting/changing the password.
Enter a new desired password.
To confirm the password, enter the password entered in [Password] again.