SIgning in to iCloud requires a password. My problem is that I don't know the password for the Apple ID associated with the iCloud setting. I cannot sign in or out. I cannot reset the password because the email address for the Apple ID has been canceled. I also get a message "xxxxx@xxxxx is not an Apple ID". I do have another, valid Apple ID (and password) but the system doesn't allow me to overwrite the existing, invalid ID with the new one.
