Child Theme

Hi, just install your Network theme and i have a question (or two :slight_smile: ). I want to customize it. And what i understand it is better to do a child theme than modify the parent theme. I see in the folder of Network theme their a child theme folder. How should i activate it. I uncomment the line “Uncomment the following line and add your custom child styles to ‘_inc/css/child.css'” and nothing happen. Should i move the folder child? And what if i want to add new functions how can i add only in the child?