Follow these steps to set an unlock sequence for the first time or after you disable a previously set unlock sequence.
Touch the
.Touch Set up screen lock (under the Screen unlock section of the Security settings).
Touch Pattern, PIN, or Password.
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 touch Next (twice). Draw your pattern (connect at least 4 dots) and touch Continue. Then redraw your pattern and touch Confirm.
PIN: Locks the screen with a number sequence. Enter a PIN (at least 4 digits) and touch Continue. Reenter your PIN and touch OK to confirm it.
Password: Locks the screen with an alphanumeric sequence. Enter a password (at least 4 characters) and touch Continue. Reenter your password and touch 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.