We have a great feature that allows customers to modify their orders directly through their account! If you log into your account, and choose your orders, you'll then click on the "order details" button of the specific order in question. You'll then scroll down to the "Modify this order" link (screenshot below), where you'll be able to adjust all pertinent order information (ie. time, date, headcount, choices, instructions etc).
Once you've changed what you need to, you can click submit changes and it sends the changes off to the caterer for confirmation. Once confirmed, you get an email letting you know your order changes were accepted and you'll be all set!