Glad you like the plugin, @topher1kenobe!

The plugin unfortunately does not support descriptions for Posts or Pages.

What I recommend (and do myself) is enable the editor on the blog page (aka the Page for Posts page) and then output the contents of that page on the blog page (home.php or similar in the theme) with something like this:

<?php echo '<div class="archive-description blog-description">' . apply_filters( 'the_content', get_the_content( null, false, (int) get_option( 'page_for_posts' ) ) ) . '</div>';

Hope that helps!