I do not remember if I am a Makro member

If you don't know if you already signed up as a Makro client, you can check with our customer service team providing your tax number. 

You can contact our support team by calling to our customer service phone number 900 907 503, or through our contact section on our website https://www.makro.es/contacto-makro 

If you are a client you can check with them the status of your account and get information about how to purchase in our stores and other channels.

If you don't own a Makro card yet, they will provide you with plenty of information abour requirements about how to become a customer.