The first thing on any system to be doing is reviewing the manual that comes along with it. There should be a section in there that covers installing memory. Not being familiar with how dimm slots work and what they look like won't help. Dimms install easy as long as you remember some basics like esd prevention since memory is a sensitive type of hardware.
Never touch the exposed contacts! Each dimm will see a notch where a tab in the dimm slot fits into for the one way only placement down into the slot. The slots themselves are long and thin often black if not blue or green on prebuilt systems. On custom builds the boards may see orange and purple colored dimm slots as well as blue or green. If a 32bit version of Windows expect to see the max of about 3-3.25gb out of the 4gb total. This is due to the 3gb barrier factor in the 32bit structure.
