you mean how to use uTorrent or what's bit torrent?

It is rather easy to create a new torrent. To do that select Create New Torrent issue in the File menu. Then a window will appear on the screen offering you to select the file source you will be sharing later. You can choose a single file or a group of files excluding some of them from sharing.

also, you can add a torrent to the list either from your computer or from the network. If you have a file you want to share with other users you can add it in the following way:
а) select Add Torrent issue in the File menu
b) select Add Torrent issue in the Torrents menu by right clicking on it