Toshiba GD-1210 Operator's Manual page 157

1
Press the [USER FUNCTIONS] button on the control panel.
2
Press the [ADMIN] button and then the [PASSWORD] button.
3
Enter the administrator password (6 to 10 digits), and then press
the [ENTER] button.
Ask your administrator for the administrator password.
4
Press the [FAX] button.
Registering the Terminal ID 155