Hook widget area for Instagram feed before footer.

functions.php

<?php
// Do NOT include the opening php tag.

// Add Instagram widget before footer.
add_action( 'genesis_before_footer', 'sp_instagram_feed_widget' );
function sp_instagram_feed_widget() {

	genesis_widget_area( 'instagram', array(
		'before' => '<div class="instagram"><div class="wrap">',
		'after'  => '</div></div>',
	) );

}