Deleting?

Anyone know how to delete comments left by people? I know I haven't posted in a while. I am just lazy and with the holidays, it was crazy. I will post later though. I have a very sick 8 month old. He has a double ear infection and an absess on his little testicle (was that too much info)? Poor guy is miserable and all he wants is to be held. So a post is coming soon! I promise! But if someone could teach me how to delete comments, that would be great!