Navigate to the install page using the blue action button above. You should then click the install button on the top right corner.
Activate your twitch extension by setting it as a panel or video component. The panel will make the window show up below your video. The component will overlay the window over your stream. The video component will only appear when your stream is live.
Copy the link and enter it into a Broacast Software (OBS, Xsplit etc..) by creating a new browser source. Or paste link into a browser based window. If pasting link into a regular browser you will need to click on the screen before sounds will play. Click the test audio button to check if your panel is receiving sounds.
Click the add source button and find the browser option.
Enter the url into the browser source box.