My iPad is disabled I can’t get to the serial number

If your iPad is disabled because you have forgotten the device passcode, you’ll need to follow this:

https://support.apple.com/en-gb/HT204306

The serial number is on the back of your device.

But don't post that here.

If your device is disabled because of a forgotten passcode, the only way to resolve it is to connect to a PC (with iTunes installed) or Mac computer (with iTunes or Finder as appropriate).