Greetings MAZZY1,
Welcome to the Apple Support Communities!
I understand that you are being prompted to sign into your iCloud account on your iPad, but are unable to sign in. I understand that you have already changed the password as well and are still unable to sign in.
In this situation, I would recommending signing out of iCloud and then back in fresh to try and resolve the issue.
Sign in with a different Apple ID on your iPhone, iPad, or iPod touch - Apple Support
- Tap Settings > iCloud on your iOS device. If you see the option to sign in, you can change your Apple ID now.
- Scroll down and tap Sign Out. In iOS 7 or earlier, tap Delete Account. After you sign out of iCloud, you might not be able to access some of your data that's stored in iCloud until you sign in again. If you're part of a family, you'll need to sign back in to use Family Sharing.
- Choose Keep on My iPhone or Delete from My iPhone.
- Enter your password.
- Go to Settings > iCloud and enter your Apple ID and password.
- Tap Sign In.
If you updated your Apple ID email address and your device repeatedly asks for the password to your previous Apple ID, you can temporarily change your Apple ID to resolve the issue.
Cheers,
Joe