I'm pretty sure the bad link just went to this same page, but Darrel has updated the site layout... There's not really anything to write a HowTo on... Once it's installed, you click on Port Forwarding in Server Manager, then select whether it's for TCP or UDP, and type the external port number and the internal IP and port you want to forward to. The panel is fairly limited in what it can do. There are other more complex things you can do with ipchains from the command line. You should be able to find a bunch of ipchains stuff with a Google search, if that's what you need.