Trouble login in with new email and password both accepted by FB

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Hello, I changed my email address and password and both were accepted but when I go to get in it says that the numbers at the top of the square are wrong and I can't send anything to facebook. How do I fix that - I also received a code for iphoto which i don't know what to do with - pls help - very frustrated have been trying for 1/2 hour
Thanks