I need help with front-left.php

I am really enjoying this template and my first WP-MU site is almost ready. There is something however that I couldn't figure out how to configure wish is the left-bottom area of the template. What is the way to do it? I guess I need to install a plugin. I tried to read all the threads that I can think of but couldn't find an answer yet. Maybe this is pretty obvious but I really need help to get this last part of the template working.

Thanks a lot