1. Go to 
Settings > 
Passwords & security > Screen lock.
2. Tap Pin.
3. Enter 4 to 16 digits.
4. Tap Continue and then tap OK to confirm your password.
Note
If you do not want to set other lock methods, tap Cancel.
Settings > Passwords & security > Screen lock.2. Tap Pin.
3. Enter 4 to 16 digits.
4. Tap Continue and then tap OK to confirm your password.
Note
If you do not want to set other lock methods, tap Cancel.