Some of the visitors here may be new to blogs. At the bottom of each entry is a link for comments (if any) on each post. To read the comments on an article, click that link - the same link includes a box where you can write your own or respond to another comment. Anonymous comments are accepted as long as everyone remains on their best behavior.
The little envelope icon with an arrow at the bottom right of each post is a link to forward an entry via email.
To have your own topic posted as a blog entry on which others can comment, send an email to email@example.com with "Suggestion Box" in the title or body.