How do I get it to work for Mac? Where would I find it?
Develop games in your browser. Powerful, performant & highly capable.
If you're referring to the editor itself: you can't, it's Windows only. Although you could always try running it inside of a Windows VM.
I run it on my MacBook Pro using Parallels to VM into the Windows 7 install that I did through Boot Camp, and it's great.