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It looks like I didn't take any photos of the power supply while I was putting that in, but you can get a great shot of it from this page:https://www.thingiverse.com/make:274708
In the very first photo there you can see a row of screws that tighten down on the power wires (red and black), with two screws remaining without any wires. Connect the positive and negative wires from your light to those spots with fork crimp-connectors. The "V+" and "V-" are printed right above the power supply connectors, so it's easy to keep them straight. Just be sure to use wire that's large enough for what your LED lights would use. I think what I had on hand was 22 AWG solid-core wire.