Limiting Available Functions
To prevent unauthorized operations, you can specify who is allowed to access each of the machine's functions.
Specify the functions available to registered users. By configuring this setting, you can limit the functions available to users.
Log in to the machine as the administrator on the control panel.
On the Home screen, press [Address Book].
On the Address Book screen, select a user, and then press [Edit].
Press the [User Management / Others] tab 
[User Management].
Press [Available Functions / Applications], and then select available functions.
Press [OK] several times until the Address Book screen is displayed.
Press [Exit], and then log out of the machine.