Change your iCloud login information - https://support.apple.com/KM205092 - "Go to the Apple ID website https://appleid.apple.com/, then sign in to change your Apple ID or password."
What to do after [or before] you change your Apple ID email address or password - https://support.apple.com/HT204071 - "After you change your Apple ID email address or password, you might need to update your sign-in information with any Apple services you're using." - Or if you're seeing persistent disabled messages or repeated requests for the password to your previous AppleID.