Wrong email on App Store on iPhone?

I'm trying to buy something and I keep getting the message that the password is incorrect. Well, I had to change my email and no longer use the old one, but for some reason the old one is popping up when I try to buy stuff. I already went into settings and entered my new email and password there.

Go to:
http://appleid.apple.com/....apple.com
on your computer at home

Enter your old email and password you use for iTunes or click "Reset your Password"
Changing your email on your phone doesn't change it.

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