Well, the string in my target looks like this "C:/ProgramData/Electronic Arts/Need For Speed World/Data/nfsw.exe" US:
[Only registered and activated users can see links. Click Here To Register...] a 1 (That's the target to the PC where the server will be host)
The 2nd player should have this: ".../nfsw.exe" US
[Only registered and activated users can see links. Click Here To Register...] public ip:1337/nfsw/Engine.svc a 2
So, the 2nd player must have a 2 at the end and your public ip (if you want to play via internet) or the IPv4 address (if your 2nd player is in the same house with you and play via LAN).
Edit: You can't race at the moment, cause the server isn't stable. Just 2 racers can join the lobby.
Hope that helps so far. :)