Add comments to the ticket to share extra info with the chef or kitchen staff. For example, "Without onion" or "Peanut Allergy".
To add a ticket comment:
Tap ••• next to Send ticket in an open receipt.
Tap Add comment in a pop-up window.
Type a ticket comment and tap Send.
To add a product or dish comment:
Click a product in the order.
Add a comment to that specific product.
Or change product quantity if necessary.
Go back by clicking < Hide at the top left of the comment window.
Following guides might be helpful too: