Ports ? ok how Please

i have seen the FAQ and i see the site i have to go but still im not understanding want to do to open my router/pc ports any help please

i ill be tankful also sorry for my poor English heheh is the best i got

Go to http://portforward.com

It has specific instructions for you router there.

dude i got there but

wen i chose my router i says to chose the game to configure or something and i dont find Gmod only Half-life
so want page i chose

Choose “Half Life 2 Steam Server”.