Hi,
open part-social-icons.php and replace
echo sprintf( '<li><a href="%s" %s><i class="fa %s"></i></a></li>',
esc_url( $used[ $network['name'] ] ),
$target,
esc_attr( $network['icon'] )
);
with this
echo sprintf( '<li><a rel="noopener noreferrer" href="%s" %s><i class="fa %s"></i></a></li>',
esc_url( $used[ $network['name'] ] ),
$target,
esc_attr( $network['icon'] )
);
and
<li><a href="<?php echo esc_url( get_theme_mod( 'rss_feed', get_bloginfo( 'rss2_url' ) ) ); ?>" <?php echo $target; ?>><i class="fa fa-rss"></i></a></li>
with
<li><a rel="noopener noreferrer" href="<?php echo esc_url( get_theme_mod( 'rss_feed', get_bloginfo( 'rss2_url' ) ) ); ?>" <?php echo $target; ?>><i class="fa fa-rss"></i></a></li>
If you decide to proceed with this modification I would suggest you create a child theme, copy over the files you are editing and make the modifications there. This will allow your changes to survive future theme updates. If you directly edit the theme’s files, all changes will be lost once you update.
Have a look at this guide to learn more about child themes and how to create one https://www.cssigniter.com/ignite/beginners-guide-child-themes/
Let me know if you need additional help with this.