At the present time, users cannot delete comments. You can only edit your own comments as long as someone has not responded to them.
However, depending on the reason you want the comment deleted, it can be deleted by a moderator. Simply flag the comment, using the 'flag this' link at the bottom of the comment. If the comment violates the Terms of Service, we will delete the comment (and all replies to that comment) for you.
We do value the freedom to say what you want, though, so we only censor comments when they are a clear violation of the Terms of Service. If you want the comment deleted simply because you did not like what it said, we probably won't be able to help you.
