can’t comment

Apparently your theme has a single.php; does that include:

<?php comments_template(); ?>

somewhere in The Loop?

I’m not seeing that template reflected in your single post pages. Rather, it looks like all query types may be using index.php.

Just place it in The Loop where it seems appropriate. Look for <?php trackback_rdf(); ?> and try inserting it right after this.

Note that comments_template() is “query aware”, which means it will only display comments and the comment form on a single post or Page. So placing it in index.php is not an issue.

CSS!

Look for this in your style.css:

#commentform textarea {
width: 80%;
}

and change it to:

textarea#comment {
width: 80%;
}

You can similarly edit or add properties for the rest of the edit form id’s, classes and html elements.