1. From the home screen, press the Menu key.
   
2. Tap Settings.
   
3. Scroll to, then tap Security.
   
4. Tap Screen lock.
   
5. Tap the desired option.
   Note: For this demonstration, tap PIN.
   
6. Enter the desired PIN.
   
7. Tap Continue.
   
8. Re-enter the PIN.
   
9. Tap OK.