1) Provide screenshot of the code. I don’t see any code on your site https://prnt.sc/x7vpb3
2) Did you install WPBakery page builder plugin? (Appearance > Install plugins). Use the WPBakery row with columns and add the Banner element to every column to add banners like on the demo. Or provide us with temporary WP Dashboard access and we’ll help you with this.
3) Watch video tutorial on how to create footer https://youtu.be/gY-x4m47Duo It’s for the XStore theme but do the same for the Legenda, it uses the same way.