how do I change apple store id?
I have changed by apple id, but I cannot change my apple store id in order to update apps
iPhone 6s Plus
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." E.g., if you are getting persistent sign-in messages.