also, u need to check your application readme/manul to make sure it works with uPNP protocal.If not, u need to find out the port it uses then do "port forward" on the router to forward the port(s)
647i(流浪的步行万里)
to your PC (u need to setup PC ip address as static IP address).
If u don't understand above easily, u need find somebody understand it to do it for u.