How do you change your ipohne apple store user name email address while updating the applications?

To change the Apple ID email address associated with your iphone's App Store, go to Settings, tap on your name at the top, then select "Name, Phone Numbers, Email." Here, you can tap "Edit" to add or remove email addresses. After updating, you'll need to sign out of your current Apple ID in the App Store and sign back in with the new email address. Make sure that you verify the new email to complete the process.