Go to Settings > Game Center, where you can:

  • Sign out (tap your Apple ID)

  • Allow invites

  • Let nearby players find you

  • Edit your Game Center profile (tap your nickname)

  • Get friend recommendations from Contacts or Facebook

  • Specify which notifications you want for Game Center. Go to Settings > Notification Center > Game Center. If Game Center doesn’t appear, turn on Notifications.

  • Change restrictions for Game Center. Go to Settings > General > Restrictions.