If you're going to allow your customers to choose feeding options for their bookings, you'll need to configure the feeding items first.
When adding feedings, they must already be added in KC desktop as this is where it will pull the item from. If you have not already setup your feedings in desktop, you should go do that now. Once added, return to the OLR setup.
Your editing view:
Your customers view when making a reservation:
Note that in the image above, the text with instructions on choosing feedings, is custom. Learn how to edit that text here: OLR Boarding "customize pages" explained