Sony VAIO PCV-RS310 Reference Manual page 51

8
Press down evenly against the module's upper corners. The latches
snap into position, holding the module in place.
!
To avoid damaging a memory module slot, move the end latches slightly
outward to relieve pressure. The module clicks into place.
9
Reinstall any components or add-on cards you may have removed.
10
Replace the cover. See
Upgrading and Maintaining Components
"Replacing the cover."
37