yes. I agree with capdan.
Best way to find out the port being used by bittornado is to look within the programs options.
write down the port number, go into the routers config screen (manual should point you to something like 192.168.2.1) and set up the router to port forward that port. Unfortunately, I cant really give you a proper step by step because all routers have slightly different setups but the basics would have to be to find the settings relating to virtual servers and set the port forwarding up there.
Oh, nearly forgot, easiest way to find your local private ip bindind is by going into comand prompt and typing ipconfig /all.
Look for the ip address to say something like 192.168.1.x
This is the binding address to use.
Hope weve helped you mate