How to actually deploy multiplayer shootout in RL

Considering Multiplayer Shootout from the Learn tab:
So, I can open a couple windows in the editor and simulate online play, I can create a package. I can put the package on my server. My server hosts my registered domain.

Now I’d like to play the game that’s in the package on the server from my computer here at home, and I want to play against my friend, playing on their computer at their home. How do I do that? Did I need to tweak something before I packaged it to make that possible?

I’m pretty good at following directions, but I’m just learning, so I need to know all the steps. I can’t seem to find any instructions for how to play the UE4 multiplayer tutorial game as a multiplayer game in the “real world” anywhere.