You can use the Postmates mobile (iOS and Android) or web app to request a delivery from any merchant in your city. Once you've located the restaurant or store you'd like to order from, add the items you want to your cart, input your payment and contact info, and hit "Get It Now".
If the merchant’s menu or catalog isn’t available in the Postmates app, you’ll see the option to “Add Your Items” after choosing that merchant, which will allow you to create a custom order. Just make sure your instructions are as specific as possible so your Postmate will know exactly what to get. For instance, “One large slice of pepperoni, please.”