How to change or reset your iPad's passcode, even if you don't remember what the passcode is

To reset or change your iPad's passcode, you can use the "Passcode" menu in your Settings app, or reset the entire device.

How to fix a disabled iPad by connecting to iTunes or Finder

If your iPad says it's disabled, you'll need to connect it to iTunes or Finder to restore it. The exact steps will depend on which iPad model you own.