Concerned about the security and privacy of your data on a lost or stolen Mac? This wikiHow teaches you how to erase your Mac using features built into Apple’s Find My app or the iCloud web interface.
How to EASILY erase and factory reset your Mac!
For this method, you'll need an iPhone or iPad that's connected to the same iCloud account as the Mac you want to remotely erase.
Find and open the Find My app on your iPhone or iPad.
You’ll see a map and a list of devices associated with your iCloud account. Tap your Mac to select it.