I lost my MacBook Air, how to register it
Hi, I lost my MacBook, and I did not register it previously.
How do register for MacBook on Apple site
MacBook Air
To register your MacBook Pro to your Apple ID, open http://supportprofile.apple.com, log in with your Apple ID, choose Add Products, and follow the steps.
You will have to insert your MacBook Pro's serial number, that you can find in the box or in System Information.7 Jun 2013
Taken from Google.