When it comes to wiring a real life description is often the best to easily see how you will hook up your wiring.  Below you can see our FN-BC04-KIT along with the wiring diagram for the FN-BC04-TB.  The most difficult problem with wiring the FN-BC04, and many of our other boards that are like it, is getting the shared ground for all the buttons.  It is also possible to split the shared button grounds between the power input ground (-) and terminal block ground.