Sometimes components or features need an external script to work properly. Adding one in Elementor is pretty painless once you know the right place.
Go to WordPress Dashboard → Elementor → Custom Code. Click Add New, paste your script (for example a <script src="..."></script>), then choose where it should load (usually Body End). You can also control where it runs, like:
Publish it when you are done. This is the cleanest option because it keeps scripts organized and avoids duplicating them in multiple pages.
Edit the page in Elementor, drop in an HTML widget, and paste the script there. This is fine for one-off pages, but it can get messy if you do it a lot.