Want to comment? Register, choose a username, and then go to the Free Speech Zone (see it on the upper right in the navigation bar?). There you can discuss whatever you want. It’s one long comment thread. It’s pretty much a free for all. The discussion wanders all over the place.
You may notice the categories on the right sidebar. This is where the posts are collected by categories like politics, religion and so forth. Feel free to browse the categories, read the posts and comment.