Why WordPress doesn't show widget area in dashboard?

Hello there,
I have design a website like Wordfeud helper. I am facing a problem with my WordPress dashboard. There is no option of widget in Appearance on WordPress dashboard. Kindly guide me about it why it happened.
Regards: Maria Cleh.

Widget Areas are normally defined in the theme (functions.php), however Frontity is not a theme or uses any WP themes to display the frontend.

You could create a plugin which defines the widget areas instead, but (afaik) does Frontity not use them unless you code them in your Frontity theme.