To order, enter your address or wherever you want to send the food. Then browse the offerings either by restaurant, location, or type of food. Look at the menu for each restaurant and order what you want, then pay from the app itself, enter a discount code, or ask to pay when the food arrives. That's it!
Each restaurant has a detailed page with lots of information, including reviews and its overall rating. It also shows the business hours, so you'll always know whether it's open.
You can save your frequently used addresses, orders, and restaurants to access them more quickly. That way, you can save time by ordering the same thing again without selecting each item individually. And as a bonus, by ordering via GrubHub you'll often get special discounts.