“Add to cart” button can be added right inside the modal window to allow users to add the product directly from the section they are visiting.
If you want this process to take place in Ajax, enable “Enable Ajax Add To Cart”.
If you want the popup to close automatically after the add to cart action, enable the option Close popup after “Add to cart”.
On the contrary, if you want to redirect users to the “Checkout” page after they added the product to the cart, enable the option “Redirect to checkout after add to cart”.