The first step was to mark the placement of the buttons. I used a white chalk pencil, made a cross and centered the button over it.
Next, I lowered the foot down onto the button. You have to manually adjust the width of the zigzag so the needle hits the holes and not the button.
This amazing little foot has a bar running down the center. The needle moves back and forth over the bar. When done, you gently slide the button towards you. Having the bar there, raises the thread and creates a slack making the button easier to push through the buttonhole. I remember learning to sew buttons on clothing using a pin across the top.