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, swipe up to access all apps.
Navigate: Settings > Security & Location .
Enter the current PIN, password or pattern.
Tap Add fingerprint.
From 'Touch and lift', place your finger on the sensor until it vibrates then lift.
Repeat this step as necessary until the process is complete.
For greater accuracy, finger placement should vary slightly each time.
To add additional fingerprints, tap ADD ANOTHER then repeat step 6.