Yes, you'll need to solder in a 5x2 header where there's currently just through holes. The board plugs into the 5x2 header AND the ISP header (the existing 6 pins already there) so that the adapter card hangs over the edge of the Melzi with the ribbon cable plugged in underneath. There will be two spots on the adapter board that don't have pins that corresponds to the gap between the two sets of pins. You'll also need +12V if you want to have the ability two switch transistors installed via gcode.
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