Deleting messages

I've had a few requests from people to delete comments made by them on my blog. I don't know how to do that. I have tried but will have to consult an expert. If anybody has a clue to give, that would be most useful. Next time you want to make a comment, sit on it until you are objectively clear about what you want to say in a permanent way if you don't want to regret it later. Personal stuff is best left to less public mediums.