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How do I add JS and CSS to WP (Flatsome)

I have a codepen that I would like to import into my WP setup. It is an expanding column layout, which includes custom CSS and JS. Link here: https://codepen.io/thedonquixotic/pen/WGYXyd

Now, I have tried a few different ways, latest being that I used the plugin WP Coder: https://wordpress.org/plugins/wp-coder/

I followed instructions, whish is to upload the JS and CSS file through admin panel, and then using the plugin to include the uploaded files, as well as uploaded the html. When I call the div id as per instructions, absolutely nothing happens. http://oriyadigital.co.za/test-1/

I had instances where the CSS and HTML displayes correctly, but never the JS yet.

Please can you give me the “Dummies guide to” for this?