asking for old apple id password...how to remove old apple id?

i have an apple id setup using an old email address and the iphone keeps asking for the password, even though I'm already signed in with the email address that I changed my account to.

So i'm signed in and everything works, except when I want to change something, like my photo, the phone keeps asking me to sign into icloud with my old apple id. confused.

super annoying. asks me several times a day.