Plugins are tools that can help a server with tasks, like administration tools, entertainment, and other utilities. To install these plugins you must go to the Exiled Plugin Framework Discord to browse currently supported plugins and community made plugins.
After downloading a plugin's DLL you should navigate into the servers plugin folder on either the on site file transfer, or by using a FTP-Client of your choice.
Folder Path for the Plugins Folder: .config/EXILED/Plugins
Then you should place the DLL into the folder and restart your server.
To configure a plugin you should go to the Exiled Config folder.
Folder Path for the Config Folder: .config/EXILED/Configs
Then you can open the config for the port number of your server.