Peter,
Thank you for contacting us. To add content to the sidebars, go to the Appearance -> Widgets settings page. There are many different areas you can add widgets. For the main right or left sidebars, add the widgets to the Right or Left widget areas. You can find out more about working with widgets in the documentation.
https://intensevisions.com/documentation/intensity/widgets/
Let us know if there is anything else we can help you with.
Thanks,
Chad