To accept cash for an order, after adding items to the bill screen, touch the Pay button at the bottom of the bill screen.
The cash owed will be displayed on the top left of the payment screen, with several potential denominations of cash listed as buttons with blue numbers. If the customer pays with a cash amount different from the buttons listed, you can enter Custom cash in the box on the right of the payment screen.
After inputing the cash received, Instore will display the change owed in a large black box on the top of the screen.
If you have a printer + cash drawer linked to the iPad, the cash drawer will open.