Become a Time Lord and regenerate!
Open your server's main folder and navigate to /plugins/ProjectRassilon/. If the folder does not exist, start and stop your server.
Open the file named config.yml. It should look something like this:
In the config, you configure the plugin settings. It includes comments that explain the meaning of each setting.
Open the file named messages.yml. It should look something like this:
In the message config, you set the messages the plugin displays in game. It is still a work in progress, as not all messages are supported and there is no documentation whatsoever.