Unless you're not using at least MMF2, there's really no reason to be using Moo in comparison to the far superior OINC extension.
However in answer to your question, all you need to do to run a server is go use the "Host" action to any condition. It'll ask for a port, and you'll use that port in conjunction with your IP address to connect to your game.
This is highly unrecommended though because MMF2 can only process so many loops per second, and even on simple games, having more then 4 or so people is going to cause the game to start to lag quite a bit, simply because the server cant process and pass the information quick enough. For this, you'll want to move to OINC and run a Python server. Dizzy has some very useful video tutorials up over at Clickteam.