This story is currently using With Single Sidebar Page Template. Every story has five options for its story page: Full-Width, Single Sidebar, Immersive Photo, Immersive Half Photo and Dual Sidebars*. Simply, select which you would like in the box at the top of the right column of the Edit Story page. The default for this option can be set on the SNO Design Options page under the options for Story Page Templates.
You can design your sidebar by choosing which the widgets to display. Just go to Widgets under Appearance on the Dashboard.
*The Dual Sidebars template is only available if your site is set to display at 1200 pixels wide or greater. The site width can be adjusted in SNO Design Options under the options for Appearance.