Young Jedi, you must use careful reading skills and closely observe every word. When you formulate your response, wait until you have RE read it to see if you have answered the question, and if the answer is appropriate.
After the fifteen edit minutes are up you cant - technically. Tho i have discovered that when youre fifteen minutes runs out if you IMMEDIATELY go 'back' to the list of answers then click on your answer right away you get 6 more minutes. After that you cannot edit or erase your answer.