As a buyer, you can add or edit your address on the payments page, right before placing an order. You cannot edit your address after the order is placed. If the wrong address has been indicated, alert your seller via the Carousell chat as soon as possible before the item is shipped out.
As a seller, you can edit address upon generating shipping code. If you've made an error in the first consignment note you've generated, you're able to regenerate a new consignment note only once more.