What its asking for is your apple id. Hopefully, you might have some record of what that original email address was, as thats what it wants in order to sign into your apple id, and hence your ipad.After the new IOS update, some passwords have been invalidated due to their format.What you need to do to fix this issue is go to the link below, enter your applie id.https://iforgot.apple.com/After entering your apple id, either answer your security questions and reset your password. Or , have an email sent to your email address. Then open your email and click the reset link inside that email to reset your password.Once you have set a new password. Turn your ipad off, then on. And enter the password. All should be well now!If you get stuck or run into any issues, let me know!I strive to provide great service, and greatly appreciate a rating of excellent ( 5 stars ) selected and submitted below this answer or at the top right of the screen. I always answer follow up questions.Dustin S.Senior Technician and Network Switching Systems Operator / Maintainer.