Question about Simon shirt placket button thingies

I’ve printed and cut out the pattern etc, and I’m up to the button placket/s part and I’m unsure what to do, I chose the one where they’re already attachment to the pattern itself but I’m not sure if I need to follow any of the other instructions because they’re confusing

(Edit, I’ve figured out some stuff but am confused about the button hole(?) placket??? The instructions look different to what my pattern looks like, I’ve included image example)