WordPress.org

1. Upload addauthor folder to the /wp-content/plugins/ directory
2. Activate the plugin through the 'Plugins' menu in WordPress
3. Place <?php if( function_exists( 'wolly_addaut' ) ) wolly_addaut(); ?> in your templates where you want to show the author description WITHIN the loop.
4. Insert new class in yours style.css '.clear' and 'ul.addaut' 'ul.addaut li' and 'ul.addaut li'. You find an example in the file 'sample.css'
5. register to gravatar.com yours authors
6. fill in, under yours profile, the description of the authors

For 2.8 and 2.9 use the 1.2 for 2.7 use only 1.0 cause the 1.2 has the new function.