On the checkout page, check everything before placing the order:
Your order settings.
The delivery address and time.
Any delivery instructions (for example, "leave the order at reception").
Your payment method.
Then select Place order.
You may also see recommendations to add more items to your basket here.
Setting your delivery address at checkout
If you didn't choose a delivery address before reaching checkout, select it here on the checkout page. After choosing it, click Save to confirm it. The address isn't selected until you click Save.