Hello man,
First off i need to inform you this will remove the hardware firewall protection from the router to your system ,
But if you wish to do this then to in to the router page :
http://192.168.0.1 User name = admin Password = sky ,
From there click on advanced ,
The fisrt thing you will see is ( Default DMZ server )
You will need to enter the last part of you computer ip address ,
To get this on your pc click on start then run - in run type " CMD " press enter you will get a black screen type in here " ipconfig " it will get you yout pc`s ip address ,
From there go back to the router page and enter the last part of the ip address to the default dmz server and click apply ,
After a few mins close every thing and check the port again .