If you cannot log into the Apple App Store because you don't know your App STore password, there is a process to reset it. If you know your apple ID, which is an email address, then just go to this website and it will help you reset the password. https://iforgot.apple.com/password/verify/appleid If you can't remember your Apple ID, you will need to visit this Apple website https://iforgot.apple.com/appleid and provide some additional info and Apple will find it for you. Then you can reset the password.
I hope that helps. If you have any other questions, please do not hesitate to contact us.