1. From the home screen, press the Menu key.
   
2. Tap System settings.
   
3. Scroll to, then tap Security.
   
4. Tap Screen lock.
   
5. Tap the desired security setting.
   Note: For this demonstration, tap 'PIN.'
   
6. Enter the desired PIN, then tap Continue.
   
7. Re-enter the desired PIN, then tap OK.
   
8. From the lock screen, enter your PIN, then tap the Center Nav key.
   
9. To change your screen lock, from the security screen, tap Screen lock
   
10. Enter your current password, then tap Continue.
    
11. Tap the desired option to set a new lock screen.