Wow, so I was about to call BS on this being a weirdly convoluted way to do this, but instead I learned something. In the pictures you can see a panel, right above the Windows Authenticity sticker, with a black "CAUTION" sticker held in by a single screw. Remove this panel and, voila, there's your RAM slot. I kept wondering why the author of this guide was having the reader go to all the trouble of removing the keyboard when obviously you could access this area from this spot on the bottom a whole lot easier.

Well, guess what? Contrary to my initial belief, this is NOT just a more convoluted method of reaching the same slot! So yeah, it's probably worth mentioning that there are actually 2 slots in different locations for anyone else who may be screwing around with this ancient laptop and be as confused as I was for a second there. (I suspect the author just forgot to mention it, since you can see they've removed that back panel stick already in the Step 4 pic.)