For some people, their iTunes account, iCloud, even Apple Online Store accounts are one and the same. The email address and password combo they use to log into the iTunes Store, iBooks Store, and App Store is identical to the one they use to log in iCloud email and Find my iPhone, is the same one they use to checkout from store.apple.com. It's a beautiful, unified dream. Others, however, have separate iTunes accounts. Whether that's because they're so old they predate iCloud, or because they're shared with a partner or family, or simply because they want them that way, the email address and password they use to log into iTunes is different than iCloud, and has to be set up separately. If you're one of those people with a separate iTunes account, or you ever need to change which iTunes account you're logged in on, you're in luck — Apple makes it easy to do!