Elegance has 3 Footer widgets:
They are configured as you see below:
Drag a search widget into the Footer 1 widget area.
Then beneath that drag a custom menu widget. Please keep in mind, if you want a specific menu here you will first need to create it in Appearance > Menus and give it a recognizable name.
Drag a Testimonial Rotator widget into this area. You will need to configure it as you see in the image below:
Drag a text widget into the Footer 3 widget area and add the shortcode for the Instaram Feed plugin.
You will need to link your Instagram Feed with the plugin. The plugin settings are listed in the WordPress menu on the left in your dashboard: