If you have several addresses where you want orders delivered, you must indicate the zip code where you want to receive your order.
It is very important to correctly enter the zip code because depending on the place of delivery, you will have to order from the new or the old page. This is why when you enter your zip code at www.mercadona.es, the system automatically routs you to the web page you can order from.
You can add your addresses from: "Account > Addresses" or during the purchase process before entering the payment method. Each time you add a new address, if it is not possible to order from the website, the system warns you automatically.