Marketing Banner Help adding a Widget

Please help, been trying to add what was described as “adding a widget” aka “Marketing Banner” to my theme but does not appear to be available on the Free High Responsive theme.

Below is the script I am trying to add to the “Front Page/Home Page” but in the ‘WP Dashboard>Appearance >Customize>Widgets’ but get the following informational: “Your theme has 1 other widget area, but this particular page doesn’t display it” i.e.: on my HomePage.

Additional information Please see the below URK as I am “Getting Blocked” when I try paste their “script” to add the following Marketing Banner: https://app.gethearth.com/dashboard/tools