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Settings > Security 
Protect Your Phone with a Screen Lock 
1.  Swipe up from the home screen and touch Settings > 
Security > Screen lock. 
2.  Touch Swipe, Pattern, PIN, or Complex password. 
  Touch Swipe. Anyone can unlock the screen by 
touching the display and sliding up. 
  Touch Pattern to create a pattern that you must draw 
to unlock the screen. 
  Touch PIN or Complex password to set a numeric 
PIN or a password that you must enter to unlock the 
screen. 
Use the Fingerprint sensor 
Unlock the screen, answer calls or read notifications using 
the Fingerprint sensor. 
Open Settings > Security > Fingerprint. 
Touch Fingerprint management to set up the sensor to 
read your fingerprints. 
Additional settings are available: 
Tap the sensor to answer incoming calls 
Swipe down to View notifications 
Swipe up to view Recent apps