1. From the home screen, press the Options key.
   
2. Select System settings, then press the Center Nav key.
   
3. Select Security, then press the Center Nav key.
   
4. Select Screen lock, then press the Center Nav key.
   
5. Select PIN, then press the Center Nav key.
   
6. Enter the desired PIN, then select Continue and press the Center Nav key.
   
7. Re-enter the desired PIN, then select OK and press the Center Nav key.
   
8. To unlock your device, enter the required PIN, then press the Center Nav key.
   
9. To change the lock screen type, from the Security screen, select Screen lock and press the Center Nav key.
   
10. Enter the current PIN, then select Next and press the Center Nav key.
    
11. Select the desired option, then press the Center Nav key and follow on-screen prompts to set up a new Lock screen type.