Struggling to remove related videos and have exhausted the existing answers

Hi folks,

First, I’ll offer an apology for asking what may be a silly question, but I’m new to this (first site), and I can’t seem to find an answer that works.

I’ve added a widget that will take the form of a play button, that opens into a pop-out lightbox, autoplaying a Youtube video.

<a href="https://www.youtube.com/watch?v=SXK-pRivCbI?width=640&height=480 "rel="wp-video-lightbox" title=""><h2><span><span style="color: #3533b5;"><span data-icon=""></span></h2>

This works fine, but I’m trying to ensure that related videos don’t show up at the end, and none of the ‘rel=0’ or ‘rel=false’ options seem to work.

I’d also like the box to close automatically once the video ends, but I’ve found nothing that works for that either.

Any help would be greatly appreciated.

Thanks

https://www.ads-software.com/plugins/lightbox/