Make sure that you have both of the necessary new parts, and that they are undamaged:
White plastic Jumper Board Spacer.
Jumper Board marked with part number TD-TDMY-A and assembled with three 1x3 male pin headers.
The Jumper Board pictured here is green, but yours may be a different color.
Check to make sure that none of the Jumper Board pins are bent. If any of them are slightly bent, attempt to bend them back into position with a small pair of pliers. If any of them are damaged, please contact us for a replacement.