You do not need a Parental Control PIN to hide channels or watch programs on hidden channels.
To hide channels, press the MENU key to bring up the main menu.
Repeat for every channel you want to hide or unhide.
When you are finished:
Even if a channel is hidden, you can still view it by entering the channel number using the remote.
For more information on using your Parental Controls, watch the Help On Demand videos on creating your PIN, and locking channels.