How does the J5create video capture work exactly?

So I got my hands on the j5create JVA01-N Video Capture USB Hub, and I really don't know how to get it to work. Just to be more clear, I want to stream me playing Pokemon Legend Arceus on my Nintendo Switch to my friends, whether that's on Discord or Twitch, I don't really care, as long as I can get it to work that. I got 3 minitors and plently of HDMI, DVI and VGA cables, I just don't understand where goes where.

I'm aware it sounds stupid and probably easy, but I'm really not good at all this techy stuff