Need help connecting disabled ipad to internet

Hello there! I am in the process of erasing my ipad's data using iCloud, so I can then back it up, after getting locked out permanently (It reads "iPad Unavailable" on the screen.) after forgetting my passcode too many times, the only thing that is stopping me is it saying it needs internet to do so. How do I connect my ipad to the internet when I can't get in?