This how my "live" scene looks. As you can see at the bottom I have a card for "stream starting" and "ending"
One thing that people use is "studio mode"

Where they can edit stuff while seeing what's live.
I haven't tested really to see if the things to interact with actually work. The bar at the top for a goal, the heart at the bottom, and the Ko-Fi click in on the bottom right of my windows. Testing wise in the software itself they all work, but keep in mind those are things almost geared exclusively toward Twitch.
There's some easy guides to follow online. But basically, at least with this software, you need to match your service to your stream key
I suggest just downloading the program and poking around while reading some guides to see what it has to offer. That's what I did and I still don't know what all it can do, or if I have it set up "right".