You will need to download one of the best torrent clients for Mac listed above. Once you select which torrent client works best for you, you can set it as your default client, so whenever you click on a torrent link to download, your torrent application will automatically open.
To actually open the media file, after it has finished downloading, you’ll just need to locate the folder on your Mac that you created for your torrents. Or, you can do a spotlight search (click on the little magnifying glass icon in the top right hand corner, and search for the content you’ve downloaded.