Facetime auto answer

hey guys i was reading online about auto answer on Facetime and was wondering how to do it for specific people only, like certain email or phone #...

i got my source from here but im a noob at macs (for now) and have no idea on how to do anything this man says...

http://osxdaily.com/2011/01/17/automatically-accept-facetime-calls-mac/

Here is the Email:
Auto-accept FaceTime calls from a specified email:

defaults write com.apple.FaceTime AutoAcceptInvitesFrom -array-add email@address.com

Here is the Phone:
Auto-accept FaceTime calls from a specified phone number:

defaults write com.apple.FaceTime AutoAcceptInvitesFrom -array-add +14085551212

Main reason to use this is to be able to use my computer as a camera when im not home to see who takes stuff from my room...