How do I insert a script tag?

How do I, for example, add the following to the javascript files referenced at the bottom of the body?

<script src=""></script>

Many thanks.

In the JavaScript section of the files tree in the bottom right of the screen > right click on js tree > then select link js file > on the pop up paste your cdn url.

If will then be referenced and your can then choose the ordering of which is file loads first

Read the tutorials

Read the tutorials