Janice displays the home page without a visible a sidebar. If you want to use widgets, create a slide-out sidebar by adding widgets to the Main Widget Area. This easily-accessible area is tucked away under a button on your main page.
However if you want the classic Right Sidebar on single posts and pages, just navigate to a single post and then add widgets via My Sites → Customize → Widgets → Right Widget Area.
The second way you can add widgets is via My Sites → WP Admin → Appearance → Widgets → Right Widget Area.