Restore from an iTunes backup

If you tap Restore From iTunes Backup, you're brought to the Connect To iTunes screen. Connect your iPhone to your computer and open iTunes; after clicking your device in the source list, you'll see the Set Up Your iPhone screen, which asks if you'd like to set it up as a new iPhone or restore from a specific backup. Choose the correct backup, and click the Continue button to proceed. This process is significantly faster than restoring from iCloud, because you're transferring data over USB, not over Wi-Fi.

Add an Apple ID

If you choose to set up your iPhone as a new device--or after you choose an iCloud backup to restore from--the first thing you have to do is supply an Apple ID, or create one if you don't have one. If you've ever purchased something from the iTunes Store, you've signed up for an Apple ID (it's usually your primary email address). Your login information for Apple's iCloud service should also work for signing in.

Use your current Apple ID: Already have an Apple ID? Tap the Sign In With An Apple ID button and enter your username (usually your email address) and password. Apple then spends a few moments linking your device to your Apple ID.