Doubt about Network level loading

So, I'm a newbie programmer and more than this when we talk about networking, so I'm trying create a scene with a server browser and another scene with a map where the players will fight...so i'm trying to load the map and spawn the clients there into the network, so I know that the answer is this Network Load Level But I'd like to have an explanetion about where should I attach that script, and another thing, I'm trying to translate this to c# but it's not working...I'm trying to combine that script with this one Tutorial Network to do what want...someone help me!!!