You can find the menu on the printer's control panel below.
Settings > General Settings > Fax Settings > Receive Settings > Save/Forward Settings > Common Settings
On the Web Config screen, you can find the menu below.
Fax tab > Fax Box > Inbox
Fax tab > Save/Forward Settings > Common Settings
You can select the operation to print the received fax or refuse to receive it when the Inbox memory is full.
Password protects the Inbox to restrict users from viewing received faxes. Select Change to change the password, and select Reset to cancel password protection. When changing or resetting the password, you need the current password.
You cannot set a password when Options when memory is full has been set to Receive and print faxes.