Fingerprints – use a finger to unlock the device: Settings ❯ Touch ID and Passcode ❯ FINGERPRINTS ❯ Add a Fingerprint. To add, gently press a finger tip on the home button/power button. Try holding the device as you would naturally for a thumbprint (from the side). Up to five fingers can be added. (when a finger tip is not recognised the Apple ID password will be required)