This should be a simple question; I feel I'm missing something obvious. Haven't flown mainline UA in 10+ years so I'm not used to the app and web layout.

CLT-DEN coming up this Thursday, domestic first. "Meal offered." Where do you actually have the option to make a selection in advance? Some pre-order link I found (https://www.united.com/en/US/preordermeals) says "Preorder window is closed." I'm within 5 days of departure though. There's a "special meals" thing on my trip details page - "special meals aren't available for any of the flights on your itinerary."

What am I missing? Do I just not get an option here?