HP EliteBook 8740w Mobile Workstation - Manual (Page 105)

c. Gently press the memory module (3) down, applying pressure to both the left and right edges
of the memory module, until the retention clips snap into place.
NOTE: Depending on the memory configuration of your computer, the left DIMM connector
may not be populated.
11. Align the tabs (1) on the memory module compartment cover with the notches on the computer.
12. Close the cover (2).
13. Tighten the memory module compartment cover screw (3).
14. Replace the batteries.
Adding or replacing a memory module in the expansion memory module slot 93