FrameMarket and GridMarket Child setup

HI, a couple of questions about Framemarket, and “grid market.” The child theme doesn’t appear in the WP appearance menu. Wondering how to verify that it is correctly installed. (The live preview does indicate “GridMarket” in the header.

Also, wondering how to configure my site to look like the demo, with the etzy style home page, etc. Also basic stuff, like how do I access the cart, etc. that doesn’t seem to be explained in the YouTube video series.