The FileChef interface is very simple. There is a text box in which you can type whatever you want to download and a series of categories that you can check to help focus your search (movies, software, images, music, etc.). When you click the search button, the app will redirect you to your browser. And from there, on your own browser, you can download whatever you want.
FileChef is a great application if you can't use a torrent client for whatever reason, since you can use it to download just about anything you can think of.