WordPress,shopperpress,astore install

Hi everyone, having examined the internet I seem to be the only one with this problem, which probably means I’m stupid.
I’m working with wordpress 4 and a new shopper press with a child theme (flowershop) I have built an amazon store and have the code, now when I go to appearance /editor there seems no instruction where to put the code, like there is without a child theme,
Can anyone put me out of my misery ! This is my first effort at a shop !!
Phill