To set or remove the core carrier designation login as a Broker Administrator and go to Administration → Carriers.
In the Active Carriers tab find the appropriate Carrier either using the Search box or navigating through the pages at the bottom of the table.
All the carriers with green names are already Core Carriers, while blue is the default for all others.
Each row contains several buttons to perform various actions on the carriers.
Convert an active carrier into a core carrier by clicking the icon.
Remove the core carrier designation by clicking the icon.
Changes are updated immediately in the application.