1. From the home screen, press the Menu key.
   
2. Tap System settings.
   
3. Scroll to 'PERSONAL', then tap Security.
   
4. Tap Screen lock.
   
5. Tap the desired option.
   Note: For this demonstration, PIN was selected.
   
6. Enter the desired PIN, then tap Continue.
   
7. Re-enter the PIN, then tap OK.
   
8. To change the lock code, tap Screen lock.
   
9. Enter the current PIN, then tap Next.
   
10. Tap the desired option.
    Note: For this demonstration, PIN was selected.
    
11. Enter the desired new PIN, then tap Continue.
    
12. Re-enter the new PIN, then tap OK.