connection.Send(msgType, short) not working

Hello, I have been trying to learn how to use the multiplayer system for a few days already, but I still don't understand how the message system works and how you communicate with each client individually (Like if you wanted to start a card game, then tell each client to spawn their boards with different orientation, client 1 has his base on the bottom of the screen and client 2 has his on bottom of his screen).

Anyway, I tried something like this. Can anyone explain to me or at least tell...

connection.Send(msgType, short) not working