Open a web browser like internet explorer or Netscape.
Enter the ip address of your router in the address bar of your browser. In the picture above the address bar has http://www.google.com in it. Just replace all of that with the ip address of your router. By default the ip address should be set to 192.168.2.1.
You should prompted for your password. Enter your password now. By default the password is blank. Click the Ok button to log in to your router.
On the left hand side you will see a series of four menus. In the one titled firewall click Application Gateways. This will bring you to the following menu.
When you are done specifying port triggering configurations click apply to save your changes. Well thats pretty much it.. You are done!