Check your motherboard manual for the correct placement of the RAM modules. If you don't have one, search the internet using the manufacturer name, model #, and model name to find one and download it for future reference
Changing the sockets, however, is unlikely to change the amount detected.
FYI, if you are running a 32-bit Operating System, your machine will never see more than 4GB RAM. You'll need to upgrade to a 64-bit version of that OS. Instructions on determining the "bitness" of your OS vary depending on the version. Your machine's "System type:" should be shown on the basic info screen. Finding that screen also varies on the version you have installed.