I've never used this board but going off normal terminology I would guess that you need to connect your outputs to the U1, U2, U3, U4 terminals and the ground to the G terminals (you may need to common these up if your lights aren't). I also suspect that the 4 jumpers link the input side ground to the output G on a channel by channel basis, so pull thes for proper isolation. And check that your lights don't require too much current, opto's do have a finite current rating.