Hi there and welcome
You will have to reset the iPad, there is no other way to remove this.
To do the reset
Connect the iPad to the computer and open itunes
Hold the power and home button down until you see
"iTunes has detected an iPAd in recovery mode..."
Click Restore iPad, let this complete and it should now work
Let me know the results please
yes but the instructions I gave bypass this.
You only connected it, you need to connect then
Hold the power and home button down until you see the Apple Logo then release.
Please review again the instructions I gave and make sure you do the, exactly as I have specified please.