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    Go to the Customizer -> Footer Settings.

    The footer template that is best to select for adding widgets is Widgets Boxes Template. But you can also add widgets to the Footer 7 Template, or to the Footer 4 Template.

    To insert widgets in the widgets boxes, go to the WordPress Admin dashboard -> Appearance -> Widgets.

    Simply drag and drop widgets from the list of available widgets, to the Footer First Box/Second Box/Third Box Widgets sections.