Find "Fingerprint Manager"
Slide two fingers downwards starting from the top the screen.
Press Lock screen & security.
Press Fingerprint Manager.
Press the required setting.
Press DONE and follow the instructions on the screen to create an additional phone lock code.
Press NEXT and follow the instructions on the screen to add your fingerprint.
Turn off use of phone lock code
Press Screen lock and key in the current phone lock code.
Return to the home screen
Press the Home key to return to the home screen.