To find your Serial Number on your MacBook:

1. Click on the Apple menu in the top-left corner of the screen.
2. Select "About This Mac"
3. In the new window, click on the "Overview" tab.
   You are now able to view the serial number.

You might also be able to find the Serial Number engraved on the bottom of your device, or on the sticker placed on the box your item arrived in.