To edit your question, simply go to the question page, and click on the edit symbol, located to the right of the question (it's shaped like a pencil). Make your changes, and click "Save."
You can submit an edit on a question the same way you post answers that are not edited.
There is no way to take a question off of Answers. However, you are able to edit your question. To do so, log into your account, click "edit question", change your question and save.
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WikiAnswers is a Q&A style Wiki. What that means is that someone asks a question and contributors can answer it, edit or or edit the answers.
Any question posted on Wiki Answers can be answered by anyone, but only members can edit the answers.
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Only those who have registered on the site can edit answers, but anyone in the world who visits this site can answer an unanswered question.
You may want to ask this on Yahoo Answers (or better yet stay here and ask and answer questions on WikiAnswers instead of Yahoo Answers :-) I would guess that since you are the one who wrote the answer Yahoo is giving you the ability to edit or delete it, but is not giving you the ability to edit or delete other people's answers.
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The Answers community requires more information for this question. Please edit your question to include more context.
The Answers community requested more information for this question. Please edit your question to include more context.