To rebook an order, first locate the order number (see image below)
Next,
• Locate the event that the guest needs to reschedule to.
• Select the "calendar" icon in the event list (image below)

Once the icon is selected it will open up a new screen.
• Place or type the order number into the open field that pops up after selecting the calendar icon.
• Select "Find Order".
Next, Original Order > Rebook Order (adjust quantity as desired - see green highlighted area in the image below)