For LED- and LED+, you can use either of the two holes that are next to each other. That is, for LED-, you can use either of the two holes near J5; for LED+, you can use either of the two holes near J6 and the two sense resistors.
What are you building? You can bring Vin via the center anode pad on the backside of the SOB (e.g., put down a solder blob and attach a spring, which would contact the top, positive nipple of a battery), or via the Vin hole of the SOB (the relatively large hole next to the ST1S03 IC).