You don't have to just use the shopping list for recipe ingredients. You can also add other items such as aluminum foil, kitchen towel or anything that you need to get at the shops.
You can add items by pressing the '+' button on the Shopping List window.
You can then type in details of the item you wish to add to your shopping list. Once you have completed this select the √ 'save' button at the bottom of the shopping list window. If you don't want to save the item you can select the × 'cancel' button at the bottom of the shopping list window.