Want to change the lock code for your tablet? It's easy, but you need to turn on use of the lock code before you can change the lock code.
Enter lock code
Change lock code
Return to the home screen
Tap Change Passcode.
Key in the current lock code.
Key in a new lock code.
Key in the new lock code again.
Tap the Home key to return to the home screen.
*Please refer to the Apple website for more information or further support.*