It's an online interview system where you record your answers. You can practice answering questions beforehand. I got an offer and spent a very long time reading the contract only to know that my ID was not accepted. This was not stated anywhere in their job description. If you email someone about your problems, you'll either get useless automatic responses or reply from an actual human being 10 days later. A total waste of time and considering how underpaid tutors are, it's not worth it.

Watch an intro video. Test your mic & audio. You will be recorded on video via their website. May "practice" timed questions before submitting responses. May attempt each question up to but no more than 2 times.