HPE ProLiant DL20 Gen10 Plus User Manual page 131

d. Install the expansion card.
Make sure that the expansion card is seated firmly in the slot.
12. To install an expansion card in the riser slot 2, do the following:
a. Remove the riser slot screw (callout 1) and slot blank (callout 2).
Retain the slot blank and the screw for future use.
b. Install the expansion card.
Make sure that the expansion card is seated firmly in the slot.
Installing an expansion card 131