Insert one RAM stick into eight slots.
Insert one RAM stick into eight slots.
Place the single RAM stick into one of the available slots on the motherboard. Ensure it aligns properly with the notch in the slot before securing it.
Review the motherboard manual, it will indicate the required slots for each possible stick configuration
If the manual isn't available, I'd choose the two black slots closest to the socket. There are 4 channels, and typically when neither of the two slots in a channel is filled, the outer slot is used. This is similar to selecting slots 2 and 4 on a 4-slot mobile (where slot 1 is nearest to the CPU).
It appears to be a label from an HP Z Workstation, typically featuring a prominent sticker on the side panel inside with the DIMM loading sequence. If this matches a HP Z440, then it indicates the correct loading order.