Remove a power supply:
Rotate the power cable retention bail to the left (to the right for the bottom power supply). Remove the power cable from the power supply.
Push and hold the orange release tab to the left (to the right for the bottom power supply) and grasp the power supply by its handle. Remove the power supply by pulling it from the SP assembly.
Install a power supply:
Align the power supply with the slot in the SP assembly. The power cable retention bail will be on the right for the bottom power supply and on the left for the top power supply.
Push the power supply into the SP assembly until it clicks into place.
Connect the power cable to the power supply and secure the cord with the retention bail at the connector.