hello
Basically the problem is that you need to download software called Hamachi
It's not a big file and only takes 28 seconds or so...
When downloaded, instructing your friend to do the same, on the setup select non-Commercial License
then startup Hamachi and follow the tutorial. When completed select the tringle icon in the bottom right and then create Network, name it whatevr you want and whatever password, but obviously give your friend both. Then gt your friend to join your network via the triangle icon in his bottom right corner.
THEN he will see a code next your name, like an IP address, that is the code that needs to be entered.
HOWEVER, you still have to change your network preferenes on FM to "run as server" and you may want to enter a password to access, to stop any hollies getting on.
To finish, you start up FM (both of you need to be on the same patch) and load up a game, your mate then goes network , selecting the database you're on, and then join other server, entering the code next to your name on Hamachi
to search hamachi of google search "Secure.logmein.Hamachi" and it takes you to a quality site
Enjoy.