Access the Cart template
Head into the theme editor (Online store > Themes > Edit theme), then open the cart template within the page selector.
Click the Cart page section on the left sidebar to open its settings.
The Cart page settings determine the overall look of the cart page by enabling certain settings, and adding content within the available fields.
Enable Note text box
Adds a "Note text box" to allow your customers to leave a message associated with their orders.
Note: The note text box will appear once an item is in the cart
Continue shopping link
Below the "Checkout" button, Parallax's cart page also displays a "Continue shopping" link. If left blank, clicking this will return the customers back to All Products page.
Adding a link in this field will allow you to control which page you'd like the customers to be redirected to.