Ram is rather easy to replace, just push the clips on the sides outward and then lift the ram and remove it. Do the same in reverse to install new stuff.
Sometimes the 2 slots are above one another or beside on another. It if it is an Compaq R3000 the second slot is under the keyboard. ARGGG
Just make sure you get the same type and speed(so the board does not try to run faster without the needed voltage.) of memory. The sticks should also only fit one way.
Video.
http://www.youtube.com/watch?v=D1oTz-F6xME