You send it to support@opensolr.com and one of our tech people will install it in the server you're using (you'll need to specify the index name for us to be able to identify the server), within about 24 hours (usually just takes a couple of hours if the plugin is fully compatible, and all goes ok)

Make sure you send the .jar it's self, and would help if you also make sure that it's also compatible with the opensolr version you're currently using in your opensolr control panel.

Please don't send git repositories, as we won't build the .jar library on our end.