Looking at the schematic, if you’re using a PedalPCB 3pdt board, you’d connect the “S3” pad to “OUT”, the “S6” pad to “SW”, and “S5” to “GND”.
(“S3” is the circuit output, “S5” is a ground, and “S6” is the leg of the LED that gets shorted to ground when the effect is on to turn the light on)