You will need to install it via this site /1ChMNjXpW5vU5iXb9DSXzqAUfY46Pc2RTL. Once it is installed you will be asked to restart ZeroNet and then refresh the site.
You will be presented with a form to add a torrent via either a magnet link or a .torrent file. To properly test if the plugin is working please click on the sintel link which will fill the form with the Sintel movie magnet and then submit.
You will need to wait a bit for it to connect to peers and start downloading the film. It will then show the video player and you can start to watch Sintel as it is being downloaded.
Once you have stopped ZeroNet or disabled the plugin (using /Plugins) the torrent will not be shared anymore.
The file will be saved in your data folder under the folder of the site that it has been requested from (so here 1ChMNjXpW5vU5iXb9DSXzqAUfY46Pc2RTL) under a downloads folder (e.g data/1ChMNjXpW5vU5iXb9DSXzqAUfY46Pc2RTL/downloads).
This should be accessible in ZeroNet via this link /list/1ChMNjXpW5vU5iXb9DSXzqAUfY46Pc2RTL. You can look for the downloads folder if you have added torrent file via the 1ChMNjXpW5vU5iXb9DSXzqAUfY46Pc2RTL site and want to access it.
Use a no-logging VPN.
It can only be used in site that supports and have implemented the specific api of the plugin. Documentation will be available soon. Devs can also take a look at this file for the available actions implemented by the plugin (https://github.com/rllola/zeronet-torrent-plugin-example/blob/master/app/stores/Site.js)