The energy chain support and guards should be in place as seen in the image below
Remove the two pre-installed bolts (circled in green) from the energy chain support. Align the holes in the end of the energy chain with these holes and then reinstall the bolts.
This end of the energy chain has the connectors that attach to the control box.
Remove the bolts that were left loose in Step 2 (circled in yellow). These will now be used to mount the other end of the energy chain. The mount will already be attached to the energy chain. Align the mount with the holes and install the bolts. Tighten them fully as they no longer need to be removed.
Remove the single Phillips bolt (circled in green) from the top of the X-axis assembly. Align the hole in the energy chain mount with this hole and reinstall the bolt.