Apple TV/FM Radio System - Manual (Page 34)

27 Installing the Card and Software
3 Use a screwdriver to unscrew the access cover for the TV/FM
tuner card port.
4 Remove the access cover by pulling it toward you.
You won’t have to replace the access cover after you’ve
installed the TV/FM tuner card, but you will need the screws.
Store the access cover; you may want to put it back on if you
ever remove the TV/FM tuner card.
5 Remove the TV/FM tuner card from its static-proof bag.
Remove both screws and the access cover.