Cart page doesn't show

Hello,

I am using the mystile theme for my site. I set up all the products with details, prices etc, and added the in a category. I went on the website to simulate a client willing to buy my dress. under the image of the dress there is the price and a button to ad the item to the cart. When I press the button, it says that the item has been added to the cart but then I don’t have any wait to continue my purchase. By this I mean that there is no cart page and no way to pay of the purchase. When I go on review my order the page is also empty. When I went on a tutorial, it seemed to me that nothing had to be set up for the cart to work properly..

I don’t know where to start or what to fix.
I am really lost could any one help me?

Thank you so much

Ps: I am not good at coding