A popup will confirm your selection and give you the option to continue to shop, or go straight to the shoppig cart.
Inside the shopping cart, review your purchase and click BUY ALL.
Fill in your details for shipping and SAVE.
At the bottom of this same page, once your shipping information has been saved, you will see two separate opportunities to apply a coupon. You can apply Seller coupons, or immediately below Aliexpress coupons. Any coupons you choose while surfing the site will be visible here.