How can i delete code project account?

Sorry for my late response, can't check email at work.
When your answer is down-voted, the best thing you could do is asking for clarification about why they down-vote you. If it turn out that you're missing a reference or something like that, Edit your answer, some people may change their vote. But if it turns out that your answer is out of topic or plainly wrong, just click delete button right beside bookmark button. Just make sure you don't delete a useful post. A useful post is always useful, even if it is down-voted. And some people may up-vote you of course.