On the left there are two wires coming out of one cable. The brown one goes to the 110 VAC hot, or black wire in house wiring, if you're putting a plug on it the smaller of the two goes on this one. The blue wire is neutral, it goes to the white house wire or the larger of the two on the plug.
On the right side are the two wires that go to the driver. Red is positive and should go to the positive (+)lead on your led circuit. If you are using a POT then that one is the one you control with the POT. The black wire is your ground. It comes back from the ground (-) on the LEDs.
You should have around 110 Volts AC on the two wires going into the left side of the driver. You should have 27 volts coming out of the right side (if the POT is all the way turned up). Trimming the POT (turning it) will vary the current and/or voltage going out.
Be very sure you have the driver tuned down before you run them.
Fat
(PS, if his is too confusing, just PM me and you can bring them up)