At any point of time if you wish to boost your sales by running offers or promotions, you can add the same in your business app.
Tap on the hamburger icon and then on Queue settings in the drawer menu. Scroll down to Offers and promotions section and turn this feature on. You can specify a date till which you wish to run the offer and also upload your promotional graphic in this section. Your current offers and promotions as set by you will be visible to all customers who use the Q Waits app. Once you are done with the offers and promotions, you can simply tap on the graphic and remove it and also turn off the settings.