How can we add an author BIO and Picture at the bottom of each authors post? Is there a plugin for this?
It's normally a part of the theme. What theme are you using ?..show us your blog. If your theme doesn't do that ,you can add code to your single.php file to make an authors box appear. You would of course have to go to your users settings in your dashboard and fill in the information. The photos are Gravatars. Set up a Gravatar account and your photo will show whenever you sign in anywhere (that supports Gravatar) with the same email.
One of my themes had this automatically, and I loved it, but haven't had a need for it on my other sites.. Anyway, I haven't used any of these, but found them while looking for a plugin for you: http://wordpress.org/extend/plugins/user-photo/ http://www.designersandbox.com/wordpress/author-image-plugin-for-wordpress/ http://wordpress.org/extend/plugins/sem-author-image/ http://wordpress.org/extend/plugins/profile-pic/ http://wordpress.org/extend/plugins/author-avatars/