How to control Widgets / Sidebars
Make sure the "Widget Area Manager" plugin is installed (email us if having trouble installing this).
View the page you wish to modify (eg: Contact Page). At the top of the page is the "Admin Bar" (this bar displays when you are logged into WordPress). In the admin bar is a menu option "Left/Right Column". Use this menu to choose the position of the sidebar (eg: left/right/hidden) and control which Widgets to display on this page.
To add content to these widget areas please go to WordPress backend and go to Appearance > Widgets.