The first time your iMac starts up, Setup Assistant walks you through the simple steps needed to start using your new Mac.
Tip: Press the Escape key to hear how to set up your Mac using VoiceOver. Press Command-Option-F5 to view accessibility options. To learn more, see in the menu bar, you can add it. Open Sign in with the same Apple ID to use any Apple service, on any device—whether it’s your computer, iOS device, iPadOS device, or Apple Watch. It’s best to have your own Apple ID and not share it. If you don’t already have an Apple ID, you can create one during setup (it’s free). See Access your iCloud content on your Mac.
Choose an appearance: Select Light, Dark, or Auto for your desktop appearance. If you want to change the choice you make during setup, open System Preferences, click General, then select an appearance option. You can also set other preferences here.
Set up Touch ID: If your keyboard supports it, you can add a fingerprint to Touch ID when you set up your 24-inch iMac. To set up Touch ID later, or to add additional fingerprints, open System Preferences, then click Touch ID. To add a fingerprint, click What's it called on my Mac? and Mac Basics Quick Tour to learn more.