After placing an order, you can change or add an address by clicking on the delivery address indicated on previous orders. If there is no address available yet, you can add it by clicking on "Add address".
You can change, add or delete addresses from: Account > Addresses > Delivery Address
You can modify the address provided for an order you have already made if the order is still in progress, that is to say, it is marked as "Confirmed", by accessing My Orders. To do so, select the confirmed order > Delivery Address > Edit