You may change your shipping address directly from the Order Status page. Just look for the "Update" button underneath your address:
Note: This only works to correct typos or add a unit number, and must be within 10 minutes of placing your order.
If 10 minutes has passed, or you need to change your address entirely, please cancel your order and place it again with the updated address.
If your order has already shipped, you may contact the courier directly and request they update the address. To find out which courier is delivering your order, check the Order Status page.