NEC Express5800 series User Manual page 185

Push the tabs at both ends of the front panel.
11.
Remove the front panel.
12.
IMPORTANT:
Place the backup device on the device carrier.
13.
14. Secure the backup device with the provided screws.
Tighten two screws on each side.
NOTES:
Be sure to use the screws provided with the backup device.
Position the backup device so that the device screw holes align with
the screw holes in the device carrier.
Connect the provided power extension cable to the power connector of the device.
15.
Keep the removed front panel for future use.
Screw hole not used
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