Depending on how long it’s been since you made the order and when you want to cancel it, it may be possible to cancel the item. There will be a “Cancel Order” button next to your online order if you can still cancel it. You can’t change an order’s “ship to” address after the order has been made. You also cannot change or cancel an online order through Costco’s website if it has already been shipped, but you can contact Costco at 1-888-426-7826 or www.costco.ca/customer service.