How do I embed an external Javascript file into CP9? for example: jQuery

Hello.

We can place javascript code between <head> and </head> tags so whenever site load script also loaded with head tag.

jQuery is already published with Captivate, so it is already linked. The version is 1.11.3

i don't know what cp9 means to you, but generally js files are embedded using something like:

<script src="path/filename.js"></script>

within an html page's head tags.