A lot of people have written to say they don't really know how to use a blog. It's simple; you just need to know where to click.
A blog is basically someone's online diary, except that others can add their comments. I start a topic by posting an initial message; others (you) add comments.
There are many different types of blogs on the Internet. I use a popular one called Blogspot. Here's how it works.
Underneath each of my initial posts is a note "3 COMMENTS," "12 COMMENTS," etc. Click that note to read the comments or add one of your own. A new window will open up, where you can read the comments and add one.
To add a comment you'll need to register, which takes a couple of minutes. You don't need to show your name publicly (you can post as Anonymous or any nickname), but the registration info (behind the scenes) is a way of having people be responsible for their posts. (It avoids spam-like posts or "hit-and-run" flaming messages.)
I very much hope you'll contribute. Dialog is the whole reason I started this blog. I want to share my thoughts and I want to know yours.
If you want to know more about blogs, a good (though long) description is at http://en.wikipedia.org/wiki/Blog. Detailed Blogspot help is at http://help.blogger.com/. But if you only want to read and post, the above is all you need to know.