When I go to game center it logos in with my e-mail and everything but when I use the apps store program and go to use update all it will only log in with my sisters e-mail. Here is what I did. My sister bought one so I plugged it into my ITUNES and installed all the free apps from my ITUNES, I setup her IPHONE with her e-mail instead of mine. She lives in another city so I just wanted to get her started with it. My ITUNES is logged in with my e-mail and I have plugged in mine and updated it that way as well I have reset everything on mine but it still keeps trying to update everything in the app store with her e-mail. This is starting to get me mad as I cannot get that e-mail off and get mine on.
Any ideas on how to fix this?