It depends on where you want it to show up. If you want to show it on a post, you need to modify single.php file. If you want it on a page, then you need to modify page.php file. Please check this page to learn more about WordPress templates: https://codex.wordpress.org/Templates.
If you don’t know anything about programming and don’t have the time to learn it, I suggest you hire a developer to help you out with it, and I’d recommend looking for one on https://studio.envato.com/, https://www.upwork.com/, or https://codeable.io/.
I hope this helps 🙂
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