Start with unplugging the lamp from the socket and remove the shade by unscrewing the 3 Allen screws with the enclosed key. Check that the 4 Phillips screws are still tightened properly, if this is not the case then they must be tightened. Then you test if the lamp works before you put the lamp back on the foot. If the lamp is working you can mount it on the luminary and tighten the 3 Allen screws.
If this is not the case you should contact the Fatboy dealer.
If your Edison the Giant is still under warranty, and you bought it in one of the stores of our dealers, you can contact them. They are happy to help you.