For access, remove this FRU, in order:
Note: This product has two DIMM slots: one under the keyboard and another on the underside of the computer. If you install a DIMM in only one of the two slots, install it in the slot located under the keyboard.
When installing: Insert the notched end of the DIMM into the socket. Press the DIMM firmly, and pivot it until it snaps into the place. Make sure that it is firmly fixed in the slot and does not move easily.