This does not exist on my iPhone
iPhone, iPad, or iPod touch:
- When you first set up your device running iOS 5 or later, enter the Apple ID you use for iTunes in the setup screens. It will be used for Store purchases and iCloud.
- If you skipped the setup process, enter your Apple ID in Settings > iCloud and Settings > iTunes and App Stores.
iMac, OS X Mountain Lion (10.8.5)