First of all , an Internet connection is required .
In the game menu : Tools -> Options ->Network tab you can see a checkbox with "Remote" caption . If you select this checkbox a connection with the host defined in host textarea (default: "studenti.scuole.bo.it" ) will be estabilished.
If the local network requires a proxy in order to connect to the Internet you must select the checkbox with "use proxy" caption. If you select this checkbox the Internet connection will use the proxy host defined in proxy textarea (default: "proxy") on the port defined in the port textarea (default: 3128)