In most cases, this requires taking out side panels if you're using a desktop PC; on laptops, you might need to unscrew a particular compartment. Locate the RAM modules that are alreadhow do slots worky in place and, using the clips at either end, gently remove them from their slots once inside. To add new RAM modules instead of replacing old ones, just line up the new RAM's notches with the slots' & firmly press down until the modules click into place. Once all modules have been firmly inserted, shut down the computer casing, re-plug the device, and turn it on.