Okay, there’s actually one other step. It’s an easy one, though. You’ll need the Genki Arcade software to communicate with the Shadowcast; it’s available as a free download for Windows, Mac, or Chrome from Genki’s website.
For the most part, the Shadowcast works — it’s easy to set up and comes at a ludicrously low price. But that low price comes with some major downsides, like a strange UI and noticeable latency problems. If you want a capture card for creating YouTube videos or streaming on Twitch, you should consider something else — even if it doesn’t fit in your pocket.