Once a question has been "answered" you are no longer able to edit it, but here is how to edit your question:
Go to the question that you would like edited.
Click on the "Edit Question" link.
Make the changes you would like to make to your question and click on the "Edit Question" button.
To reply to a question, just go to the question and type your answer in the box under the "Add an Answer" text. After you have completed your answer, just click on the orange "Answer Question" button.
at 5:15 AM on May. 23, 2010