To enable password protection, you have to supply the MASTER user with a password, to do that go to MAINTENANCE > USERS SETTINGS then highlight the MASTER USER (the first user on the list) and click the SECURITY Button, then in the password field, you have to enter the password (make sure not to forget it) and then save. Next time you restart the system, you will be prompted for a password, you can create and more users in the same screen and supply them each with a password, you can also allocate the access level for each user on a menu option bases (see below). Please note that the first two users will have access to the full system regardless of their access levels.