Open the downloaded .torrent file with your torrent client. The client will then connect to the torrent network and start downloading the files.
Before downloading any copyrighted content using torrents, make sure you have the necessary permissions or licenses to do so in your region. Also, be aware that downloading copyrighted content without permission is illegal and can result in penalties.
That being said, here's a general guide on how to download One Tree Hill Season 8 complete 720p using a torrent:
Once you've found a reliable torrent, click on the "Download" or "Get Torrent" button to download the .torrent file.
Type in "One Tree Hill Season 8 complete 720p" in the search bar and press enter. You can also add additional keywords like "torrent" or "download" to refine your search.