Remember though, the machine has to be plugged in to be grounded. Locate the memory slots. Handle the memory chip by the sides, on the green parts. Don't touch the chips or the metal connectors. The new memory is typically inserted into the slot at an angle, and then brought upright until it's sides clip into the holders on the slot.
Memory only goes in one direction.
If it isn't sitting in the slot, try turning it around. LC's and low profile cases often have angled slots. The fact that it partially obscures one slot tells you that you really shouldn't be doing this yourself. Once the memory is installed, start the machine. If you have a Powermac and it gives you a really cool startup sound of a car wreck, you have bad memory.