To remove items from your cart, you first need to view your cart by selecting the cart icon in the top right of the application.
Here in your cart you can see all items you have added. From the cart you can continue shopping by adding more items or you can checkout and pay for the items you have added.
To remove items in your cart you need to select the "Edit" button in the top right corner of the app. Once the "Edit" button has been selected you can now remove items from you cart by hitting the corresponding red delete buttons on each item or fee. Once you are done, you may select the "Done" button in the top right.