I am very new to build Wordpress Website, so please bear with me if I don't describe things properly.
There is a website providing the .js file for flying bats on the screen. https://www.delphitools.info/2013/10/30/pimp-your-website-with-an-halloween-bat/
It says that I can just insert the script by using
<script async src="https://cdn.delphitools.info/wp-content/uploads/2013/10/jsbat.js"></script>
but it doesn't work on the website.
What did I do wrong? Do I have to change something in the JS file?
Thank you in advance.