Turn on your device. You should see a Hello Screen. If you’ve already set up your device, you need to erase all of its content before you can use these steps to restore from your backup.
Follow the onscreen setup steps until you reach the Transfer Your Apps & Data screen, then tap Restore from iCloud Backup.
When asked, sign in with your Apple ID to restore your apps and purchases. If you've purchased iTunes or App Store content using multiple Apple IDs, you'll be asked to sign in to each. If you can't remember your password, you can tap Skip this Step and sign in later. You won't be able to use the apps until you've signed in with your Apple ID.
Stay connected to Wi-Fi and wait for a progress bar to appear and finish loading. Depending on the size of the backup and the network speed, the progress bar might need a few minutes to an hour to complete. If you disconnect from Wi-Fi too soon, the progress will pause until you reconnect.
Now you can finish setup and enjoy your device. Content like your apps, photos, music and other information will continue to restore in the background for the next several hours or days, depending on the amount of information there is. Try to connect often to Wi-Fi and power to let the process complete.
Connect your device to your computer with a USB cable. If a message asks for your device passcode or to Trust This Computer, follow the on-screen steps. Get help if you've forgotten your passcode.