Use these steps to reset it and regain access to your account.
How to reset Apple ID password - 9to5Mac
How to reset your Apple ID password in 3 different ways if you've forgotten it or lost your device
Apple Support on the App Store
Apple Support on the App Store
How to setup family sharing without apple email-addresses - B+C Guides
Best Tutorial: What Is My Apple Id Password? How To Retrieve It
If you forgot your Apple ID - Apple Support, email icloud
If you forgot your Apple ID - Apple Support, email icloud
I want to use my Apple ID but I lost my old phone that had the
How to Reset Your Apple ID Password: 5 Simple Ways