How do I open a port?

[tomi]

The question in the title. I need to open a port, but I don't know how.

 

I have Firewall disabled and I don't have any type of anti-virus software. My Router is a Kozumi K-1550NR, in the settings I have these options: 

 

http://i.snag.gy/mvozj.jpg

 

http://i.snag.gy/F5tym.jpg

http://i.snag.gy/SA1Y5.jpg

http://i.snag.gy/uyLs3.jpg

 

Thanks

[rufee]

According to the first image just fill in:
Description - A name for the port (CoD, CS etc...)

Internal Host - IP address of the machine you want the port forwarded to, if you don't know it just go to the Command Prompt and type "ipconfig" you will see it.

Protocol - You can leave it at ALL, but if you only need UDP you can change that.

External port - What ports will be forwarded (ex. 5555-5556) put the port you need here.

Internal port - Leave the same as above.