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It is supposed to accept the password ***** if the account/password ***** ***** with another iPad.
You can remove the old iPad from iCloud website. On your computer, go to www.icloud.com
Login to your iCloud account that you used on your old iPad. Then click Find iPhone there (yes iPhone). Click on All Devices at the top from the resulting screen and select the old iPad. Now click "Remove from my Account" and the iPad will be disconnected from your account. Then the iPad can be registered with another Apple ID.
Refer this article --> https://support.apple.com/kb/PH2702?locale=en_US
If you have any questions or would like any additional information, please let me know and I will continue to help you
Note, you must sign in to correct Apple ID or iCloud ID that you used on your old iPad. If you don't remember the ID used on your old iPad, you can find it from here --> https://iforgot.apple.com/appleid
If you don't remember the correct password, then you can reset it from here --> https://iforgot.apple.com/