Very easy, just take a short video on your own time and send it in for approval. There is a follow-up call in which they talk to you about your previous experiences and look at your record. They also verify your qualifications through simple assessments.

You are sent a link to an online video interview. They ask you about previous tutoring experience and the last question was asking you to do a mock-tutoring session. It's very awkward because you have to make up what you want to teach on the spot, but you get unlimited time to think of responses.