Currently Being ModeratedMay 5, 2012 8:18 AM (in response to buchatariq)
Welcome to the Apple community.
For basic and airplay, simply tap the airplay icon on the iPad when you are watching compatible content (i.e. video from your video app.
For mirroring, when displaying the content you wish to mirror on the iPad 2, iPad 3 or iPhone 4s, double tap the home button (quickly) and swipe the bottom row of apps to the right to reveal the playback controls, tap the AirPlay icon and select your Apple TV from the list of available devices.