Multiplayer

Hi all,
I'm just wondering how do i get Multiplayer started once the simulator is running, i saw the IP box was empty so i type it in and pressed ok but nothing came up?
Thanks for your help
Carl
I'm just wondering how do i get Multiplayer started once the simulator is running, i saw the IP box was empty so i type it in and pressed ok but nothing came up?
Thanks for your help
Carl