What data are you trying to sync? If it's one of the Apple databases, like contacts or calenders, go to Settings>icloud and turn on the services you want to sync on your devices. I'm assuming you have logged into your icloud account.
How do u sign into an iCloud account? I have my apple ID entered under settings, iCloud etc and the things I want to transfer are set to on but no transfer. I want to transfer mostly music and pictures.