For some reason, when I search for the Group Manager plugin on my server's Console, it won't show up... It shows 2 plugins, GlobalGroupManager and GroupManagerPromote http://prntscr.com/5bfri1 But I want the actualy group manager plugin, can someone tell me how to get it with hosthorde?
The page you were on in your screenshot is the BukGet page. You can install the plugin by uploading the Group Manager jar to your plugins directory via FTP then restarting the server.
Here's our video tutorial for how to manually upload plugins: (relevant bit starts at 2:10) You can also find our FTP guide here: https://www.hosthorde.com/forums/resources/getting-started-with-ftp.31/