Nvidia BlueField-3 User Manual page 63

Step 7: Verify the plugs are locked.
Step 8: Slide the retention clip through the cutouts on the PCB. Make sure latches are facing "Black Cable" annotation as seen in the below picture.
Step 9: Clamp the retention clip. Verify both latches are firmly locked.
NVIDIA BlueField-3 DPU User Guide | 63