Yes, you can revise your order. Please follow the below instruction and have a try.
1. After adding all needed products to cart, you can have a look at your shopping cart before checking out. Click "View your entire cart" on the right side of the website page, at the bottom of your shopping cart.
2. You can revise the quantity of your order or simply "remove" the unwanted product, then just click the orange button "Update quantity" is OK.
3. Keep shopping? That is easy. Click "click here to keep shopping", right below the blue button "proceed to checkout", then you can keep shopping.
4. After selecting all wanted product, please feel free to checkout.