Find "Screen lock"
Press the menu icon.
Press Settings.
Press Security.
Press Screen lock.
Change lock code
Key in the lock code.
Press Swipe, Pattern, PIN or Password.
Follow the instructions on the display to change the lock code.
Press Swipe, Pattern, PIN or Password.
Follow the instructions on the display to change the lock code.
Exit
Press the home icon to return to standby mode.