To set options for App Store, go to Settings > iTunes & App Store. You can:

  • View or edit your account. Tap your Apple ID, then tap View Apple ID. To change your password, tap the Apple ID field.

  • Sign in using a different Apple ID. Tap your account name, then tap Sign Out. Then enter the other Apple ID.

  • Turn off automatic downloads. Tap Apps in Automatic Downloads. Apps update automatically over Wi-Fi, unless you turn off the option.

  • Download apps using the cellular network. Turn on Use Cellular Data. Downloading apps over the cellular network may incur carrier charges. Newsstand apps update only over Wi-Fi.