Follow these steps to set an unlock sequence for the first time or after you disable a previously set unlock sequence.
From the Home screen, tap.
Tap Select screen lock.
You can also select the Wallpaper or Clocks & shortcuts for the lock screen.
Tap None, Swipe, Face Unlock, Pattern, PIN or Password.
None: If you don't want to set lock screen, select None so you don't need to enter anything.
Swipe: Select Swipe if you want to swipe to unlock screen.
Face Unlock: Unlocks the screen though facial recognition. Read the information on the screen and tap . To set up Face Unlock, line up your face in the outline on the screen. Your face will automatically be captured. Tap Continue. Then choose Pattern or PIN to set another form of security when Face Unlock can't see you.
Please keep in mind that Face Unlock is less secure than a pattern, PIN, or password, someone who looks similar to you could unlock your phone, and the data used to identify your face is kept private on the phone. Also note that this feature is only available after you set up your Google account on your device.
Pattern: Locks the screen using a pattern you draw with your finger. The first time you set an unlock pattern, you will see a tutorial with instructions on how to create it. Read the tutorial and tap Next (twice). Draw your pattern (connect at least 4 dots) and tap Continue. Then redraw your pattern and tap Confirm.
PIN: Locks the screen with a number sequence. Enter a PIN (at least 4 digits) and tap Continue. Reenter your PIN and tap OK to confirm it.
Password: Locks the screen with an alphanumeric sequence. Enter a password (at least 4 characters) and tap Continue. Reenter your password and tap OK to confirm it.
From then on, any time you want to turn the phone on or unlock the screen, you will need to draw your unlock pattern or enter your PIN or password to unlock the screen.