Whether you have a one-time or recurring order, start the customization process by selecting "Your Deliveries" in the upper toolbar of your account. Then select the red button within each days' menu to customize the delivery days individually.
If your food preferences are flexible, you can toggle between different filters and meal types (breakfast, lunch, and dinner) to see various options by hitting "Filters" in the upper right hand corner of the screen. To see all meals for the week, deselect all filters.
Once done, be sure to hit "Review Delivery" and then "Update Delivery" to save changes.
Note that all menu edits must occur by 11:59pm on Thursdays. You will receive a confirmation email once you've chosen your meals.