These instructions are meant for the latest firmware of the Tomato, but should be valid for prior versions, too. The firmware for Tomato can be downloaded here.
1 Log into your router with default IP (192.168.1.1)
2 Use your username and password (default username: root password: admin)
3 Click on "Port Forwarding" in the main menu on the left
4 Select TCP in pulldown menu
5 Enter 80 for both Ext Ports and Int ports
6 Enter IP of the computer cFos Personal Net is running on in the Int Address field
7 Click on the "Add" button
8 Click on the "Save" button
Port forwarding is now configured for your computer!