Well, No problem you can ask any time about torrenting and P2P websites because it is my favorite subject.
The thing is P2P sharing software or Bittorrent clients require specific port forwards because windows Firewall blocks any suspicious activity or ports which it deems potentially harmful. But you can allow trustworthy ports through router to bypass firewall restrictions. But, do not forget to use the best torrent VPN it will encrypt your peer to peer connection.
Here is a complete guide how peer to peer file sharing works. http://www.makeuseof.com/tag/p2p-peer-peer-file-sharing-works/