NEC VERSA SXI Manual page 96

Hold the SO-DIMM at a 45 degree angle and align the SO-DIMM contacts
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with the socket in the system. Push the connector into the socket.
Press down on the edge of the SO-DIMM opposite the contacts until the lock
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tabs on the sides snap into place, securing the module.
Installing the SO-DIMM
If you are replacing a SO-DIMM and need to remove one that is already installed,
do so as follows:
Press the locking tabs away from the sides of the SO-DIMM and hold while
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gently lifting on the edge of the SO-DIMM.
When the edge of the SO-DIMM pops up and is at approximately a 60 degree
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angle, pull the SO-DIMM from the socket.
Removing an installed SO-DIMM
Using the System Drives and Bays 5-15