1. From the home screen, press the Menu key.
   
2. Tap Lock screen settings.
   
3. Tap Select screen lock
   
4. Tap Knock Code.
   
5. Tap Next.
   
6. Tap the displayed quadrants to set the desired Knock Code, then tap Continue.
   
7. Re-enter the chosen Knock Code, then tap Confirm.
   
8. Tap Next.
   
9. Enter the desired backup PIN, then tap Continue.
   
10. Re-enter the chosen PIN, then tap OK.
    
11. To use the Knock Code, while the display is off or while at the lock screen, tap the knock code sequence in the designated area.