what is it that you're trying to edit?
the servings, the foods nutritional data, the actual item entered?
I don't think fitday gives priority to food items for times eaten, etc. its just a general ordering from how you input them.
On food log in the PC version, I noticed that you can drag & drop items to the bottom, but you cant move items up the list.
I seperate my meals with custom food entrys I made ex: a custom food
then in the serving size I put the time like this 11.30 for 11:30
it might be overkill but thats how Im doing it right now to help me visualize everything.