my ipad is locked and disable

You have to restore the device within iTunes. You want to use the same computer that you always sync with so that you can restore your app data and settings. You can restore with any other computer, but you will lose everything on the iPad.

iOS: Wrong passcode results in red disabled screen

This will tell you how to restore

iTunes: Backing up, updating or restoring iOS software

If you cannot restore that way, you may have to use recovery mode

iPad: Unable to update or restore

You must do as provided - connect your iPad to iTunes on the computer used for syncing your iPad followed by restoring your iPad with iTunes.