well 1st of all its very easy......
goto the left bar of bitcomet where popular torrent sites are given[i recommend torrentz.com].......
now type the movie,game,pop album,software u want 2 download........
it will show the list of search results[like google].......
select the desired result and it will display the list of sites offering download[like seedpeer,mininova,extratorrent,piratebay,amazon etc.........
select the site and the next page opens.......
now u can click on the option download this torrent and the download hence starts.......