I think the dealer has to program the key. We had one programmed at the dealer where we bought the car and they did it for free.
How Do I Program A Factory Remote Keyless Entry Key Fob For A 2006 Ford F-350?
You need to go to the dealership to have it properly programmed.
Take it to ford for id number location, witch is hidden a wall panel inside the cab.
Yoyoyo!put key in ignition turn on off 6 to 9 times.door locks will lock then unlock,then press lock button on the new and old remotes. Done