If you need to add a freight company you can go to "Freight Companies"; select New and enter the required freight company details. 

Please make sure that the "Freight Code" should be exactly same as it is in your A/C system (The spelling should be the same). Please use the same value of "Freight Code" to the field "Alpha Code". 

Once the changes are made hit Save. Now you have added a new Freight Company.

If you need to change or make the new freight company to default;

Select WareHouses. Now change the "Freight Company" (Select from drop down list) to the Freight company which should be default.

Please contact The Order Exchange Support if you have further issues.