1 2 3 or 4 to select your player number. Press 0 to stop controlling any characters. Log on with some friends and try it out. If you don't move the player will fade away. If it says someones name that you want to control its okay.
I followed an @griffpatch tutorial on this. It took a while but I plan to use this online game code for projects in the future. I showed all the variables on the side to show what it really looks like and how difficult it can be to make the players movement smooth online.