[Plugin: Co-Authors Plus] Co-authors not displayed in Twenty Ten

Hi
I am a newbie. Presently using the Twenty Ten theme. The problem is that I can’t get the plugin to display all the co-authors in the bylines. I have already gone through most of the posts on this issue, but even after changing the code wherever it seemed fit, nothing really is happening. I am also confused as to in which file I have to make the change. Since there is no mention of author or anything in the loop.php of Twenty Ten. If anybody could help me in this regard and point me in the right direction, I would be extremely grateful.
Regards
Animesh

http://wordpress.org/extend/plugins/co-authors-plus/