If you’ve set up your AirPods with your iPhone and your Mac is signed in to iCloud with the same Apple ID, then your AirPods should be ready to use with your Mac.
Ideally, all you need to do is put your AirPods in your ears, click the Bluetooth icon in your Mac’s menu bar, select your AirPods from the dropdown list, and click Connect.
If you don’t see your AirPods in the Bluetooth menu, you can pair them manually with your Mac in the following way.
How to Pair AirPods With Your Mac
- On your Mac, launch System Preferences from the Apple menu bar ( -> System Preferences…).
- Click the Bluetooth pane.
Read more at MacRumors.com