From what I read on the plugins description it’s compatible with WP 2.9.2. Next to that I assume from the description that it interacts with the theme a lot. I would therefore install the Default (WordPress Theme) and try if it works with that theme. Maybe it works with this theme?
Maybe you just run into a Javascript error or you have Javascript disabled? Please check these source of errors as well, because it’s written that the plugin makes use of AJAX which means Javascript.