how to sync apple id
My mom gave me her old iphone. She still remembers the apple id password but her icloud account was locked due to secutiry reasons. she cannot remember the password and the receipt of the phone was lost. I was able tu log in my apple id but when i tried to update the apps, App Store still asks for my mom's apple id. How do I change this to my own apple id?
iPhone 6s Plus, iOS 10