From the home screen, tap Settings.
Scroll to and tap iCloud.
To create a new Apple ID account, tap Get a Free Apple ID and follow the prompts.
To sign in to an existing account, tap the Apple ID field.
Enter the Apple ID and Password and tap Sign In.
When prompted, tap OK to allow iCloud to access location services on the handset.
Note: If prompted to merge existing data on the device with iCloud, tap the preferred option.
Tap the toggle for each application to turn iCloud synchronization on or off as needed.
Scroll to and tap Storage & Backup.
iCloud back up is enabled automatically after signing into iCloud.
Tap Back Up Now to create a new back up of the handset.
Note: Once iCloud is enabled, the handset will no longer automatically sync when connected a iTunes on a computer.
A Wi-Fi connection is required to create a back up using iCloud.
Wait until iCloud finishes backing up your iPhone. It may take up to 30 minutes to complete.
iCloud is now set up and ready for use.