There's a very small window of time (normally just a few minutes) where you're able to cancel your order online via your order history page. If this option isn't available to you, that means the order is being worked on and it can no longer be modified. We're unable to refund shipping fees for orders that have shipped, even if the order is unwanted. We're also unable to change the items in your order or update your shipping address. Our return policy and instructions are below:
https://help.athome.com/hc/en-us/articles/203774695-What-is-your-return-policy-
https://help.athome.com/hc/en-us/articles/8835479451789-Return-instructions