If the instructions are Greek to you, head to the shop. Turn off the computer, unplug it, and take off the case. Get your memory. Make sure all guidelines are met. Your computer organizes its SIMM sockets into groups called banks .
Some boards say that two sockets make a bank.
Some say that one is a bank. Nevertheless, a bank must be full. A half-full bank will drive your computer bonkers. Also, you can't mix two different kinds of memory in a single bank. Also, many systems require you to put the memory in in pairs.