HP Notebook Reference Manual page 122

Hardware Options and Upgrades
To insert a memory module:
a. Align the keyed (notched) edge of the module with the
keyed area in the memory slot 1.
b. With the module at a 45-degree angle from the surface of the
memory compartment, press the module into the memory
slot until it is seated 2.
c. Push the module downward until the retention clips snap into
place 3.
Inserting a memory module
8-14 Startup and Reference Guide––Part 2