How to convert Single channel to Dual channel memory.

The chipset on your motherboard should support Dual Channel Memory. You need to buy two memory modules. With two similar memory modules, you have to install each memory module on a different channel on your motherboard. The best way to avoid errors is to find sockets 1 and 3 and install the modules there. The motherboard guide may help two as there is no standar when it comes to the colors used for memory slots/channels.