Set up the Find My app to locate a missing Mac, device, or item
You can use the Find My app to locate and protect lost Apple devices and find items attached to an AirTag. Before your Mac, devices, or items go missing, make sure you set up Find My Mac in iCloud settings. You can locate and protect your Mac, devices, or items using the Find My app on another Mac, iPhone, or iPad, and on iCloud.com.
For more information about the Find My app on a Mac, see the Find My User Guide.
Set up Find My Mac
On your Mac, choose Apple menu > System Settings, then click [your name] at the top of the sidebar.
If you don’t see your name, click “Sign in with your Apple ID,” enter your Apple ID (or a Reachable At email address or phone number that you added in Apple ID settings), then enter your password. If you don’t have an Apple ID, you can create one.
Click iCloud on the right, click Show All, click Find My Mac, then click Turn On.
If asked to allow Find My Mac to use the location of your Mac, click Allow.
Enter the name and password of an administrator of your Mac, then click Allow.
Location Services must be on to use Find My Mac. To turn it on, click Privacy & Security in the sidebar (you may need to scroll down), then click Location Services on the right. Turn on Location Services, enter the name and password of an administrator of your Mac, then click Unlock.
If you set up your Mac with multiple user accounts, Find My Mac can only be used by one user at a time. Turning it on for one user will turn it off for any other user that had it turned on.