Find "Security & privacy"
Press Security & privacy.
Create phone lock code using a fingerprint
Press Fingerprint management.
Press the required phone lock code and follow the instructions on the screen to create an additional phone lock code.
Follow the instructions on the screen to create the phone lock code using your fingerprint.
Press the Return key twice.
Turn off use of phone lock code
Press Screen lock & passwords.
Key in the current phone lock code and press None.
Return to the home screen
Press the Home key to return to the home screen.