They have changed a lot of things here you can only edit questions and comments for 5 minutes after posting them. You can have a question deleted by going to the contact us at the bottom of the page, you will loose 10 pts for deleting it and those who answered will loose points...
You go to the bottom of the page, and use the 'contact us' and ask them to remove it. But for editing, you are able to edit your questions, the edit area is under the question that you asked. Hope this helps.