Yes, one additional ("second") delivery address is allowed. On the Shipping Address card, click Add Second Address (shown only if you don't already have one), fill in the address, phone, gate code, delivery note, and which days of the week it should be used for, then Save. From then on the card shows Edit and Remove buttons for that second address; you're limited to one extra — the save is rejected with "You can only have one additional delivery address." if you try to add a second one while one already exists.