Lay lamp on its side and remove the 2 screws between the lower and upper lamp posts. Gently pull the 2 sections apart a few inches. Slide the plastic switch cover off by sliding upwards.

Remove the 2 screws holding the USB port circuit board to the cover.

With utility blade, carefully cut the 2 plastic mounts for the touch switch circuit board and remove from cover.

The small flat on/off button should fall out also.