How can I change my email address to login on my ipad 2 itself?

In itunes on my PC, I changed my address email, but when I try to connect to the appstore on my ipad 2, it shows again the old email address, and when I try to connect, he told me that my password is wrong.

I know that the password is right, so the problem seems to be because it is still showing my old email address.

No one knows how to modify directly on my ipad 2?

View the original article here