Go to Start, type cmd in the Search programs and files field and open the utility using Administrator rights. Type ipconfig /all and press the Enter key. Copy the IP address next to the Default Gateway in your web browser address bar and hit Enter again. If your modem security settings are not configured, enter admin as Username and password or admin as Password to open the modem’s configuration page. If it doesn't work, contact your Internet Service Provide and ask for the Username and Password. After you log in to the configuration page, look for the Port Forwarding section (check Applications, Gaming, Virtual Servers or Advanced Settings tabs) and select a pre-configured option from the drop-down list. If the application you want to add is not listed, press the option which allows you to create a custom port forwarding entry. Type a name for the entry, select the TCP/UPD option as service/protocol type and enter the port number you want to use. If you're using only one port, type the same port number in both Port Start and Port End fields. After that, enter your IP address and click Save/Apply button. If you have issues, you can get in touch with a Cosmote technician using the form from the official web page.