I would add this to Steven's answer: The link is at the bottom of the page and it says "Become a Teacher." Click on that and you'll be able to find out more.

There’s a link somewhere on how to apply. You do have to submit an introductory video. And there’s a limitation too, based on the language you are applying to teach, pertaining to how many spots are available for that particular language. Good luck, Luiz. You’d be a great teacher.