Apple TV/FM Radio System - Manual (Page 98)

2 Type a word or phrase of up to 15 characters.
You can also type a clue to help you remember the
password. The clue appears every time anyone seeking
access is asked for the password.
If you don’t want to have a clue, don’t type one.
3 Click OK.
Your password is now in effect.
Important Make sure you keep a record of your password.
If you forget your password, you will have to reset all your
customized settings (including channel names and
programmed channels) when you invalidate it, as described
in “Forgetting a Password,” later in this section.
Changing a password
Follow these steps to change a password:
1 Choose Set Channel Password from the Setup menu.
A dialog box appears.
91 Customizing the TV Tuner Settings