Colns link leads to the required software, known as drivers. If the setup disc didn't come with it, you will need to download the drivers and install them.
One piece of software that is important is Epson Scan, a handy utility for doing the scanning. The Easy Photo Printer is fine if you fon't have anything else, but the printer/scanner will need the full set of drivers. Being an Epson, they will probably need installing all in one go.
Mine is a much lowlier machine that I got purely for the scanner, I have better printers that don't cost an arm and a leg for ink when I need to use paper.