This dialog shows a list of Simple DNS Plus plug-ins currently available on this computer.
This reflects the plug-in .dll files in the "plugins" sub-directory of the directory where Simple DNS Plus is installed.
Additional plug-ins can be downloaded from https://simpledns.plus/plugins
When you select a plug-in in the left list, the right "Plug-in information" panel with show detailed information about that plug-in.
To create an instance of a plug-in, select it in the list and click the "Create Instance..." button. This will open the plug-in instance dialog.