Thanks, but I really have no idea where to add the second part of the process...? Where do I add 'hide atc' or mark or price, to each product?
Add code from file store product detail elements tagged hide.html to Store Settings > Advanced > Page Header Code Injection for the store page.
Add "hide atc", "hide mark", "hide price", and/or "hide quantity" tags, without the quotes, to each product where you want to hide the Add To Cart button, mark, price and/or quantity elements.