You need a set of RCA cables, Red & White, you will need two sets. The Cables, simply wire color to color. You nay also need, some adapters, if you cannot get RCA to Phono Jack, on one end. To make with PC, Output Socket, you need an 3.5mm Phono, Jack, and on the other end, the RCA, for connection to the Speakers
How to wire the speakers at above two links.