HP d530 Small Form Factor Reference Manual page 26

Hardware Upgrades
8. Install the expansion card.
Installing an Expansion Card
9. Rotate the slot cover retention latch back in place to secure the expansion card.
When you install an expansion card, make sure to line it up with the corner bracket,
then press firmly on the card so that the whole connector seats properly in the
expansion card slot.
10. Replace the expansion card cage.
2-16 Hardware Reference Guide