I am Ani From https://www.task4store.com/ - Shopify Small & Custom Tasks Experts ( By MS Web Designer - Top Rated Shopify Certified Experts and eCommerce Consultant from Singapore )
That is an HTML snippet you have there, which needs to be inserted into HTML code.
So as @MS_WEB_DESIGNER correctly pointed out, if you navigate to the page you want to edit in your store admin, you will see a <> icon in the top right of the editor:
Click on that and paste the code into the HTML editor:
Then click that same icon again and your audio clip should show up like this:
We’ve a little more information on editing your pages, but that’s the essence of how to add HTML code to your page. It’s exactly the same process for your blog posts too!
Are you running a podcast on your Shopify store? If so, you may find our blog about How to Start A Podcast useful!
Let me know if this helps and if you have any other questions.