If you’d like to change your delivery day for an upcoming week, visit your Upcoming page and locate the order you’d like to modify. Tap the 'Manage' button on the right hand side and click the 'Delivery Date' section. From there, select the day of the week you’d like to reschedule to and click ‘Save’. This will change your delivery day for that order, while keeping the rest of your deliveries scheduled for your regular weekly delivery day indicated in your Plan Settings.
Just be sure to make all changes by the ‘Changeable before’ date, which is displayed for each order next to the 'Manage' button on your Upcoming page.