you make your blog by simply starting a topic. each new post is a new blog entry. people can reply in your blog but if they get out of hand you can request a moderator to delete posts. you own your own blog so you have the right to ask people to stop.
For those who don't know, Tinned Meat is SPAM! Basically, this is an area for nonsense topics which don't really have any point and which some light users might find a little annoying while trying to find the 'steak' of the site.