The PCB is designed to have the footswitches mounted directly to it.
You can use wire if you like - simply connect the board pads to the
corresponding pins on the switches.
There’s really not much to it. Connect the GND and signal wires for each
jack socket, and the GND and +V wires for the DC.
If you’re building a buffered version, connect your INPUT jack signal to the
BUF pad rather than IN.
You can mount the LED straight into the PCB to save having to use bezels.
When the rest of the build is complete insert the LEDs (short leg to
square pad), and bend the legs very slightly to keep them from falling out.
Locate the footswiches into place and tighten. Now push the LEDs down
into their holes. Once tightly into place, solder.
<<< Footswitch lugs should be
horizontal as shown.
You may experience ground hum if
splitting your signal to two amps.