1. On the Settings screen, tap Lock screen and security → Fingerprints.
2. Unlock the screen using the preset screen lock method.
If you have not set a screen lock method, create one.
3. Tap Add fingerprint.
4. Place your finger on the Home key.
5. After the device detects your finger, lift it up and place it on the Home key again.
Repeat this action by moving your finger upwards or downwards until the fingerprint is registered.
When a fingerprint lock pop-up window appears, tap ENABLE to use your fingerprint to unlock the screen.