1. From the home screen, press the Menu key.
   
2. Tap Lock screen settings.
   
3. Tap Select screen lock.
   
4. Tap Pattern.
   
5. Tap Next.
   
6. Draw the desired unlock pattern.
   
7. Tap Continue.
   
8. Re-draw the chosen pattern to confirm.
   
9. Tap Confirm.
   
10. Tap Next.
    
11. Enter the desired backup PIN.
    
12. Tap Next.
    
13. Re-enter the chosen PIN.
    
14. Tap Done.
    
15. To unlock the device, draw the chosen unlock pattern.