heres what ive found:
removing/adding 100 characters adds the crayon to your post
re-arranging or moving words will not add the crayon even if the order of the words are completely different
adding 100 characters worth of words that are already in your post adds the crayon
there is an edit limit of (i believe) 30 edits every 24 hours
also, I think you can’t post on your own thread more than twice in a row, rip lfg threads