I've noticed that I can't always edit a comment or maybe a forum post I make. For some reason, sometimes-some days an edit button appears at the bottom of my comment or forum post, and other times it does not. It would be good to always provide that button -- because, I for one make too many typos, and also some times I realize I miswrote something and need to correct it.
I'm not certain, but it might be that the edit button appears for a forum post but not for a comment to a blog article.
Please add the edit button to both, and if there is something going wrong in your system that some days it is there and others it is not, please fix that.