I'm just getting started with MarketPress. I've added one

I'm just getting started with MarketPress. I've added one test product. When I view the product page, I don't see the shopping cart anywhere. How do I get the shopping cart to display?

I am using the Genesis Theme Framework and the Outreach Child theme.

If I choose "FrameMarket" or "SimpleMarket" themes under Products> Store Settings > Presentation, does that change the entire theme for my website, or does it just affect the Store pages? Thanks