HT4352: Setting up Home Sharing for Apple TV (2nd generation and 3rd generation)Learn about Setting up Home Sharing for Apple TV (2nd generation and 3rd generation)
Currently Being ModeratedMay 27, 2013 4:42 PM (in response to hutais)
In brief (assuming you have a wi-fi network) Play some music using music app, Double-click the home button, slide bottom left to right. You should see a litte down arrow, choose your ATV from the pop-up menu. Exact method varies a bit by device and iOS version, so if that doesn't work you might try reading the manual (iOS #.# for iPhone) it should be listed under AirPlay or Mirroring...
If you don't have a wifi network try the answer listed on right named "stream iPhone on appletv"