Installed this a couple of weeks ago and I don’t “get” how to make it work,
You will find the more detailed information about the plugin from the following pages but keep in mind that some of the plugin features listed on the following pages are not available in the free version of pop up plugin.
https://premium.wpmudev.org/project/the-pop-over-plugin/#detail
https://premium.wpmudev.org/project/the-pop-over-plugin/#usage
specifically link to an image and the popup works for that image (and, different popups on different images on the same page). Is there a tutorial, a video perhaps?
I think you want to display different pop over on clicking different images on same page. if it is then this functionality is not available in free version and you will have to Download the pro version of this plugin.
Best Regards,