When you turn on a new iOS device or after youâve completed the update to the latest version of iOS, follow the instructions in the setup assistant to activate your device and set up iCloud. 1. If you skipped the setup process, tap the Settings icon on the Home screen, select iCloud, then enter your Apple ID.hen set up iCloud for your Mac or PC. If youâre setting up a new iOS device, or to update to the latest version of iOS, go to the Settings menu, tap General, and tap Software Update to see if thereâs an update available. Learn more about iOS.