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Catch-22 is one must have 2 keys to add another key to the truck oneself. I believe the enhanced version of Forscan can add and delete keys but do not know for sure. Otherwise you are at the mercy of the dealer or possibly a key shop.
Since you only have one key you're stuck going to a dealer or finding the right locksmith. Locksmiths that do high end sport and luxury cars generally have the software for Fords, and they usually charge a fraction what most Ford dealers want.