First of all, to turn off or change settings for the passcode lock feature on your iPad you must know your passcode. If you have forgotten your iPad passcode you're out of luck.
To turn off passcode lock:
1. Navigate to Settings -> General -> Passcode Lock
2. Enter your passcode.
3. Touch the top button labeled Turn Passcode Off.
4. Enter your passcode again.
The passcode is now deactivated and will not be required to access your iPad.