Once you're in the machine, lift up the outer part of this rubber covering to reveal the unoccupied RAM slot.

Now put in your ram.

It is only possible to seat it in the correct orientation because of a small non-symmetrical indentation in both the slot and the ram.

You may need to bend these little metal arms out a bit to get the ram to fit in.

Dell has also provided a small instruction using pictographs on the rubber covering.

When the RAM is properly seated, you will hear it "click" into place.