when youre done you will have to download XBMC or/and PLEX for access to oh so many more networks for your appleTV. CNN, Pandora, MTV and a dedicated Simpsons channel to name a few.
To do this follow the instructions here for XBMC
(you are going to do this through Terminal on your Mac with your appleTV on and running plugged into your TV)
if youre having any other problems whatseover, email me at: firstname.lastname@example.org
i got this shit.