They are pretty easy: while like the switches they have 4 pins, there are really only 2 connections 2 pairs of the pins (like the switches) are connected together so all you need to do is figure out which 2 pins connect together and connect one wire to that and one wire to the other two pins that connect together to give you the two wires from the pedal to replace the switch on the breadboard with. If you get it wrong the pedal won't do anything (because the connection is always closed) but it also shouldn't damage anything. Moving one of the wires to another pin should both fix it and make it work.
Peter