Open your browser, go to this

address: http://192.168.2.1
That should your router's ip address. You can configure your router from there. Set up Applicate Gateway and Virtual Server parts, so that the port(s) your BT client is listening on will be forwarded to the machine your BT client is running.
If you have a software firewall, also configure it so that it allows your BT client's traffics through.
國內還是海外,是否大學生, 都不重要. 大家一起BT就好了.