If your order is already in the delivered state, follow the steps below:
Use the original packaging or a new one to return the parts.
Log in and log into your "My Account" account.
In the side menu click on "Orders" and choose the order you want to return.
At the bottom of the page click on the "Return" button.
Choose the item/s you want to return by clicking on "Return" and then choose the reason for the return for each item and click on the "Continue" button.
Choose the address where you want the collection to take place.
Choose how you want to receive your return refund.
Then click "Finish".
You will receive an email from Correos Express with the collection confirmation.
In that email will be the transport guide, which you must print and deliver to the courier on the day of collection.
If you can't find the email, please check your spam or junk folder.