I would like to play my game left 4 dead via lan.

but I have no Idea how to do this.

these are the instructions:

to play, enter this in console:
sv_lan 0
z_difficulty (easy, normal, advanced, impossible)
sv_allow_lobby_connect_only 0
map(space)(arrow down to select map)

To connect to a game being hosted, type in console:
connect (ip)


but what the heck do you mean by consoles? how do you access it?