Removing Prices/add to cart

Hello All, 

I am creating a website, where there's a store that will show my products. 

Inside  the store, and after selecting the product, each product will keep showing its price and the add to cart button even if i set the price to 0.

i have tried editing the page design and hiding the price, but this only hides the price from showing in the main products page, but if i click on a product, the product's page itself will keep showing the price and the add to cart button. 

how can i remove them?

thanks