To add a product to an order as a user in the app, you can create a new order by clicking at the top right '+' > New retail order
OR
Go into an existing order > Add other > Product > select the guest (if there are more than one guest) > select the product from the drop down menu > Next > enter a quantity > Finish.
Select the guest (if there are more than one guest) > select the product from the drop down menu > Next
Enter a quantity > Finish.
Then you can take the payment for this through selecting 'Pay £__' or head to the Payments tab > add payment.
Any products that are sold through the app will automatically adjust the stock of the product if you have selected that it should be tracked in your inventory.