HP LaserJet M5025 Multifunction Printer series - Manual (Page 279)

5. Hold the DIMM by the edges, and align the notches on the DIMM with the DIMM slot. (Check that
the locks on each side of the DIMM slot are open.)
6. Press the DIMM straight into the slot, and press firmly. Make sure the locks on each side of the
DIMM snap into place.
NOTE To remove a DIMM, first release the locks.
7. Close the formatter door.
ENWW Installing printer memory 267