You can make changes to your Grubhub order through the Restaurant Grubhub website. However, you need to make all adjustments within the first 24 hours of making your order. Otherwise, the changes might not be completed. Follow the steps below to change your order on Grubhub: 1. Head over to restaurant.grubhub.com and log into your account. 2. Click on the “Orders” option in the left-hand menu. 3. Find and click on the order you want to make changes to. 4. Choose one of the two options: “Adjust” or “Reprint.” The first one will let you add or remove items from your order. The second one will send an additional receipt. If you don’t have an account on Grubhub for Restaurants, you can sign up here.