Help: People are unable to connect to my TF2 server (router issues)?

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http://dedicatedhostingweb.org – To start off with, I have a ZyXEL ZyAIR G-2000 router and I have the following ZyNOS firmware version: V3.60(HI.1) Whenever I am connected to the internet via my router and set up a dedicated server on my PC for Team Fortress II (using the Team Fortress II Dedicated Server program that is provided by Steam), my server does not show up on the Internet Servers list, and people are also not able to connect to my server by either manually adding my server’s IP to their favorites list or by joining through Steam; whenever my friend would try to connect, he would get a “Server does not (HowTos)