Much of the setup of Currency Controller occurs during installation. Use this guide should you need to make any changes.
The updating of the currency conversion values in the instance happens on a custom system scheduler that is installed and activated when Currency Controller is installed. By default this is scheduled to happen once per day at 23:12 (12:12 PM). The frequency can be updated to run as often as every 10 minutes.
To view the scheduler navigate to Admin->Schedulers
To edit the frequency simply edit the scheduler record and update the Interval. Please be sure the Retrieve Currencies job is select should you need to edit or create a new scheduler
You can also see the history of the scheduled job running in a subpanel at the bottom of the Scheduler record.