Classifieds

I need to change the side bar on the main classified page for this site:
http://fresnoskiclub.org/classifieds/
I have a plugin for custom sidebars, no matter what I do it will not change.
I have been able in changing it on "My Classifieds"
http://fresnoskiclub.org/classifieds/my-classifieds/

Help
Crissymarie