You can place in any sidebar a widget showing the current show actually on air. This widget is added by the Pro.Radio Widgets plugin provided with the theme.
Step 1. in your WordPress admin, go to Appearance > Widgets
Step 2. Drag and drop the widget Proradio on-air
Step 3: optionally set custom parameters, and remember to click the Save button.
For more info about the appearance and location of the sidebars, please visit the Customizations section of the manual.