You probably won’t ever need to change the AresCentral configuration.
To configure the AresCentral plugin:
The game will periodically contact AresCentral to update its status and game directory info. There is a cron job to control when this happens. By default it does this daily during off-hours. See the Cron Job Tutorial for help if you want to change this.
This is the URL for contacting AresCentral. You shouldn’t ever have to change it unless for some reason AresCentral moves.