Carousel help

I’ve been working with the carousel tutorial from gotoAndLearn(). I understand the math after a lot of effort not being a programmer, but I still need help. Instead of the default continuous scrolling of the icons dependent on the mouse position, I want a button navigation system to move through each icon. So the bottom arrow buttons on the attached .fla would navigate and scroll each icon one at a time (each click). Any ideas on how to do this? thanks in advance