Lenovo ThinkStation P7 Manual page 34

6. Hold the new drive by its edges so as not to touch the circuit board and
ensure that the circuit board side is facing upward. Align the notch in the
new M.2 NVMe drive with the slot key in the M.2 slot. Insert the drive into
the corresponding slot on the PCIe adapter until it is firmly seated. Then,
insert the plug of the retention latch into the hole to secure the new drive.
7. Install the heat sink as shown. Then tighten the screws to secure the heat
sink.
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