I HAD A TILE VALIDATED BY ONE PERSON, THEN IN-VALIDATED BY ANOTHER. THE COMMENT WAS THAT NOTHING WAS MAPPED BUT THERE WAS NOTHING TO MAP THAT I COULD SEE. HOW DO I CONTACT THE EDITOR TO DISCUSS THIS?
AFAIK that is not possible, just mark the tile as done again or skip the tile and let someone else have a go at it.
p.s. please do not yell (i.e. use upper case) for your posts.