Two examples of services that can be used for streaming a webinar in Coursio is Youtube and Twitch, here is a short tutorial in how you can embed your stream from Youtube or Twitch:
Login to your Youtube account and go to your "Creator Studio"
Go to "Events" on the menu to the left and then press "New live event"
Fill in the basic info to the stream and then press "Go live now"
Wait until you see the button "Start broadcast" and press the button "Links"
Copy the Video Embed code and paste it into your Embed module.
Simply press "Share"/"Dela" when you are streaming and paste the URL in the Embed Module.
Tip: You can also embed the live chat next to the stream in Coursio.