To edit or remove unwanted products from your cart, click on "Cart" in the right-hand corner of your page.
Next to each product in your cart, you'll see "Price" and "QTY"(quantity).
To edit the quantity, type the desired quantity in the QTY field. Then click "Update" right below that box. Your order will now update with the changes you have applied.
To remove an item, click "Remove" below the "QTY" box and that item will be removed from your cart.