Here’s how to get iCloud to work on your Mac, PC, iOS device and even Apple TV:
Register for an iCloud account
While it is free, you do need to create an account on either a mobile device running iOS 5 or later or a Mac running OS X 10.7.5 or later. Unfortunately for PC or Windows users, you have to create an account on one of these platforms before you can log in from a PC.Youa re limited to ten iCloud accounts per device (though it’s unlikely you’ll need more than one or two).
If you’ve ever bought anything from the iTunes Store, App Store, or iBookstore, you will already have an Apple ID. (It’s most likely to be the email address you used to sign up for iTunes.) You can find it by logging into iTunes or App Store and the email you used will already be filled out in the Apple ID section of the iCloud screen.
iCloud accounts all stem from Apple IDs, so it’s really simple to convert your Apple ID into an iCloud account without affecting how you already use it.
To add an iCloud email address to your old Apple ID:
1. Turn on the Mail switch (or check the checkbox on a Mac) in your iCloud preference pane.
2. Convert your Apple ID into an iCloud account by opening the iCloud preference screen on your iOS device or Mac.
3. Sign in to iCloud with your current Apple ID and password.
4. Agree to the iCloud terms and conditions; now you’re ready to use the service.
If you want an iCloud email address (@icloud.com), click on Settings > iCloud on an iOS device and switch on Mail (or, on a Mac, click the checkbox). You’ll be prompted to create an iCloud email address to go with your account.