1. Go into your iPad's settings.
  2. Choose "iTunes & App Store" from the left-side menu. You will need to scroll down this menu to find this option. Simply tap on it to bring up the App Store settings.
  3. Automatically updating apps is the last setting under "Automatic Downloads". Simply tap the button to turn it on or off.
You can also turn on/off automatic downloads for music, apps and books. If on, this setting will cause automatic downloading of these items to this device when you purchase them on any other device, including your PC. If you like to keep everything synced between all of your devices, these settings will make it much easier.