port forwarding for a dedicated server

I need help with a dedicated server how do I port forward?
I tried going to this website http://wiki.garrysmod.com/?title=Windows_Dedicated_Server_Setup

I managed to do everything until the third step of the tutorial
until I came to a page that looked like this…

I have no idea what I’m even supposed to do on this website
so I decided I look at the website http://portforward.com/
the type of router I have is Cisco but I still can’t figure out what type it is…

I know this might be harder to explain but could you show me a video tutorial or a tutorial with images I’m better at following those types of tutorials than the tutorials with only words.

Use this: http://www.simpleportforwarding.com/ As long as you know your router information it shouldn’t be a problem, it sets everything up for you. Although it worked for me it was only temporary as it was my network card that was faulty, so I can’t guarantee a permanent success.