Product push is an active feature that sends a notification or suggestion to the customer at the time of their order (or before) to encourage them to add an item. It is an automated upselling mechanism.
Log in to your back office
In the left menu, click on the cocktail glass icon
Click on the name of your menu
Select the product(s) to set as push
Click on "Set as product push"
Removing a product from push
Select the product(s) to remove from product push
Click on Remove from product push in the action bar at the bottom of the page.