Each detected stream is an entry in the Stream Detector right click context menu. I think these days you can also right click on the badge to get to the Stream Detector menu that way. To copy a stream (in accordance with the parameters set in the options), you click on its entry in the context menu.

The number on the badge equals the number of detected streams. Clicking the badge clears the entries - this action is kept separate from the context menu to prevent misclicking and clearing the stream list by accident.

That's essentially it. I suppose I should add this to the description.