Adding JavaScript in middle of page

I'm trying to add this code:

<script charset="UTF-8" type="text/javascript" id="idxwidgetsrc-20693" src="//holmesgroupmn.idxbroker.com/idx/carousel.php?widgetid=20693"></script>

Is there something wrong with it? The site I'm taking it from makes it sound like it's just as easy as dropping this into a code box. I tried that in the middle of the page where I'd like this to appear and as you can see it doesn't do anything. I've also tried putting it in the source code (header and footer) and nothing happens. 

This is a Current Listings widget for a realtor from the IDX Broker service, which Squarespace recommends.

I'm using the Ventura template. No index pages.

Any help is greatly appreciated!

Please post the URL for the page on your site that has the code.

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