I have recently synced my partners iphone to my computer because his computer crashed. He has his own itunes account so we backed his phone up to icloud wiped it a re synced it to my computer. but now when he tried to access itunes through his iphone (to download music or new apps) it takes him to my account and asks for my password. In settings on his phone under itunes account it still has his user id. How do we get back acess to his itunes account from his phone?