Once your Fuel Surcharge table is uploaded to your Shipper App it will automatically calculate for each shipment, and will recalculate if you edit the shipment to change the pickup or delivery location. Click on a shipment to view the Fuel Surcharge in the lower right corner of the Shipment Details tab:

Once a pickup or delivery facility has been changed, the Fuel Surcharge will automatically recalculate.

If you have any questions or concerns you can always reach out to us at shipper-support@transfix.io and we'll be happy to assist!