How do I use the Multiplayer Custom Lobbies extension?

I’ve downloaded the Multiplayer custom lobbies extension but from what i can tell it doesn’t seem to directly add any events or conditions, I did see there was something to download from the asset store, but is that not just a preset that I could make myself? Please let me know what I’m missing. Thank you.

Im sorry but could not find much information.

Even the wiki has very little info in there.