sorry for the delay to answer, I didn't have time to answer your message when I saw it at 1st, and after I forgot it...
so, if the message "Can't find main server" appears when you create a server, it means the game can't connect to the site managames.com .
The reason can be because of your firewall. You should then allow Tennis Elbow to access Internet through the TCP port 80.
It can be also because the site is down or temporally unreachable.
Did you already manage to create a game without getting this message ?