If my 2 cents matter, I would say that only the first 5 people to CORRECTLY complete each challenge will be taken into consideration. If you did not read through all of the rules and 1 of your entries was disqualified, those are the rules. Not to be rude, but other people did it correctly the first time, so why should they miss out?
TL:DR--I don't think you should be able to edit your entry if you messed up the first time. You can make a second entry only.
And yes, people. Keep in mind that in order to be entered, you need to fill out the form on the first post of the first page, otherwise your pictures--and effort--do not count!
Keep up the good work! (: