What part is confusing. Turn on your AppleTV. Go to Settings>Airplay and turn it on.
Connect your iDevice or Mac by choosing AirPlay. See the following to set up each device to connect to your AppleTV:
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I was referring to the instructions at http://support.apple.com/kb/HT5517?viewlocale=en_US&locale=en_US.
My Apple TV is responding properly in some ways, but I cant get the AirPlay to do anything. I will kee[ wprking on it using the Troubleshooting helps.
Hoping the new Apple TV isn't as disappointing as the old Apple TV. :-)