To set the columns footer you need to go in Appearance > customize > Footer settings ( see screenshot )

Enter content in the 3 columns/sidebar by dragging the widgets that you prefer

First Footer Widget Area

Second Footer Widget Area

Third Footer Widget Area

In the first column drag the widget “SPARROW About” and complete it with image and text like the screenshots.

In the second and third column, we used “SPARROW Recent Post” and “SPARROW Advertising” widgets