How do you create versus mode in left 4 dead 2

To create a versus lobby in left 4 dead 1 and 2, You go to the main menu, press X,it will bring up the freinds only menu,press X agine and choose the setting of where u wanna play..what chapter you wanna start in then you put create lobby, go down to where it says permissions, then put the lobby to public for others to join.