They don't let you change the rating you give your driver. I gave someone a 1 star rating because they left my food at the wrong building, but then they went back and brought the food to me. I wanted to give them 5 stars because they fixed their mistake. There's no way to change ratings in the app, and after about a 20 minute conversation with customer service, I found out there's no way to change the rating you give a driver at all. Don't use this app, they don't care about their drivers.