content page needs 3 columns

Howdy,

I’m looking for help with editing the following page: bostontheatreworks.com

I’m wishing for the “content” part of the page to now have a navigation bar on the left and right of the content. I essentially want to add a div_left and div_right but i cannot for the life of me figure out how to do it with the WordPress application. I’ve found the CSS and I can make that change easily but I need to edit the pages as well. I understand the concept but the WordPress “html view” doesn’t show me the full html of the page and I’m lost as to how/where to find it.

Either an explanation of the process using the WordPress GUI or directions on how to find the file directory where the page is sotred on the webserver would be very nice.

Thanks,