The default Apple ID on my iPhone is invalid
I am trying to update apps on my iPhone. The default Apple ID is one that I used many years ago and, for which, I no longer have the password. In "settings" (both icloud and Itunes & App store) I have entered, signed in and saved my current Apple ID (a gmail address), but for some reason, this isn't the ID that comes up when I launch the appstore and try to update my current Apps. I cannot figure out how to change the ID (there is no link nor ability to "log out"). I am hoping this makes sense. Does anyone have any suggestions?
iPhone 6, iOS 10.0.2, apple ID issue