In the map you can see the address of the store. If you turn on "Monitor", Mi-Papelito will send you a notification when you get close to the store and have marked items from that store on your shopping list. When you turn Monitors on, the "As needed" field appears. Here you can enter a minimum number of items that must be on your shopping list for Mi-Papelito to send the notification. This way you can prevent Mi-Papelito from contacting you every time, even if there is only one item on your list (which is why you don't want to go to the store).
If you create a new store, enter its address and press "Show in map". Now Mi-Papelito remembers the coordinates. You can also mark the location of the store on the map.