I changed my AppleID and the old one appears on my iPad and I can't change it.  Now it states my ID or password are invalid.

I changed my AppleID and when using iTunes from my iPad, it reflects my old ID and states invalid id or password.

Sign out of the old one and into the new one.
Anything purchased on the old one will still be tied to that account.
iPad 2 User Guide (For iOS 4.3 Software)

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