I'm a promoter and have posted 6 races worth of results so far this year. I'm a bit familiar with uploading and editing race results now.
If you click on the race in the results you should get the whole race's results. Scroll to the bottom. There's a link to report missing/incorrect license numbers. I don't know where that goes because people contact me directly to point out errors.
For a promoter it's very straightforward to edit results, at least if it's just one or two of them. It's basically a visual csv file and it looks things up for you (like if I click in the license number field for a line that has a racer's name in it I get all the license numbers that match that name... I just have to choose one of the racers).
For One Day licenses you shouldn't have a license number, it should be 0 or something like that.
Hope that helps.
cdr