The seller must deliver the goods to a named port of shipment so that they arrive at the vessel and clear the goods for export.
The buyer will then bear the costs from the time of arrival at the vessel. The buyer must then take on all risks both of damage to or loss of the goods.
Are you sending the goods by ship? Get them to the side of the ship and forget about them. (Make sure you get export clearance.) It's the buyer's responsibility from there. Do make sure you have export clearance, though. And don't use FAS if water transport is not involved.
As the term FAS suggests, it can only be used where water transport is involved, whether by sea or inland waterway.