Translator L4D

Method 1

1) Hit tilde (~) to bring up console before you create a lobby.
2) Type "sv_search_key runpsiismean"
3) Create lobby and have people join.
4) Start the game.

Method 2

1) Create autoexec.cfg in your L4D2 directory (ie. C:\Program Files\Steam\steamapps\common\left 4 dead 2\left4dead2\cfg\)
2) Add the line (bind "F8" "mm_dedicated_force_servers 68.232.168.64:27015")
3) Start the game andcreate a lobby.
4) Hit F8 when you're ready to start the game.

Method 3

1) Start game
2) Turn on console with tilde (~)
3) Copy the line (bind "F8" "mm_dedicated_force_servers 68.232.168.64:27015")
4) Follow the rest of Method 2.