A good thing to know is that when you add an item to your database the card which you create can be edited at a later date. You simply tap the pencil icon while looking at your list, then tap on the item to change something in the original entry. This is not explicitly explained in the instructions, but for me it changed my rating from a 3 to a 5!
Ph1n3a5 about Shopping To-Do Pro (Grocery List), v2.2