meta slider

I am trying to follow instructions from a youtube video on how to add a meta slider onto my website.

Link to video : https://www.youtube.com/watch?v=W73umJTCFDE&t=5729s

Code:

add_action( ‘init’, ‘child_theme_init’ );
function child_theme_init() {
add_action( ‘storefront_before_content’, ‘woa_add_full_slider’, 5 );
}

function woa_add_full_slider() { ?>
<div id=”slider”>
<?php echo do_shortcode(“[metaslider id=XXX percentwidth=100 restrict_to=home]”); ?>
</div>
<?php }

The page I need help with: [log in to see the link]