<p>I would say that it should be better to ask new question. First, because it was already answered. Second, from practical point of view, if you edit your question it would faster disappear from the main page, then if you asked new one, so asking new one gives you better visibility and chance of it getting answered. Third, asking a new question may give you a chance to reword it and make it more clear, as opposed to adding "EDIT" sections that in most cases make the question more confusing and messy. Also, adding new question gives you a chance to think on what exactly is the aspect of the question that was not covered by the previous one, so that it deserves a new question.</p>
