ok its easy as pie.
You need AT LEAST one of these:
https://lovemyswitches.com/dpdt-momentary-foot-switch-solder-lug/
But you could use that switch for ALL THREE if you wanted. But you need at least one. FOr the other two you can use this:
https://lovemyswitches.com/spst-momentary-foot-switch-normally-open-soft-touch/
Then you wire them up… here is a quick skectch… but it is totally easy:
