Dell 1815dn - All-in-one Laser Printer Owner's Manual page 96

Completely open the latches on each side of the DIMM slot and remove the preinstalled memory
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DIMM.
Remove a new memory DIMM from its antistatic package.
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Holding the memory DIMM by the edges, align the notches on the memory DIMM with the grooves
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at the top of the memory DIMM slot.
Push the DIMM straight into the DIMM slot until it snaps into place. Make sure the latches fit over
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the notches located on either side of the DIMM.
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Installing Options