To ensure your impact is calculated accurately, please indicate how many items there are in your listing by using the quantity field.
If you create one listing to give away 5 different sandwiches, please tap '5'
If you create one listing to give away 20 bananas. In this case, please type '20' in the text box as shown below.
Please note that this isn't a stock/inventory counter, and it doesn't automatically reduce how many items are still available based on the number you've already given to someone else.