Before you can use iCloud on each of your devices, you need to sign in to iCloud using your existing Apple ID or a new one, then turn on the iCloud features you want to use.
You may have set up iCloud on your iOS device or Mac when you first used it. To make sure it’s set up correctly, or to set up your iCloud account on another iOS device, Mac, Windows computer, or Apple TV, go to the set up iCloud website listed below.
iCloud is available on devices with iOS 5 or later, on Mac computers with OS X Lion v10.7.5 or later, Apple TV with software 5.0 or later, and on Windows computers with iCloud for Windows 4.0 (Windows 7 or Windows 8 is required).
Note: iCloud may not be available in all areas, and iCloud features may vary by area. For more information, visit the iCloud website.