Find "Security"
Press All apps to open the main menu.
Press Settings.
Press Security.
Change phone lock code
Press Change screen lock.
Key in your phone lock code.
Key in your phone lock code.
Press Pattern, PIN or Password.
Follow the instructions on the display to change the phone lock code.
Follow the instructions on the display to change the phone lock code.
Exit
Press the Home key to return to standby mode.