To use plugins automatically, you have to first use the Plugin Configuration page to choose which plugins will be automatically executed, and set their options if they need any.
Plugin Configuration (on this screenshot, eze and regex parsing will be executed automatically.)
LRR ships with a few plugins out of the box, in the /lib/LANraragi/Plugins folder.
To install other Plugins (in .pm format), drag them to this folder and they'll appear in Plugin Configuration.
You can also install Plugins through the "Install Plugin" button in Plugin Configuration.
This feature requires Debug Mode to be enabled for security purposes. Debug Mode can be disabled once you're done installing Plugins.
Plugins have as much control over your system as the main LANraragi application does!
When installing Plugins from unknown sources, do a little research first.