For the fingerprint scanner to operate, hands must be clean and free of moisture, dirt, oil, lotion, dyes, etc.
Up to 5 fingerprints can be registered on the device.
From a Home screen, navigate: Settings > Lock screen & security .
These instructions apply to Home mode only.
Tap Fingerprints .
If presented, follow onscreen prompts to unlock screen.
Tap Add fingerprint.
From the 'Scan your fingerprint' screen, place your finger on the Power button (on the back of the device), lift it slightly then place a different part of your finger on the Power button.
Repeat this process as necessary until the 'Fingerprint added' screen appears.