Hi. Thanks for responding!
Sorry for the lack of solid detail. It's Kentico 11.0.16 and MVC (I believe - how can I be sure?). I've been given admin access to the site.
Apologies. I meant hero image.
It may be that I can't help, having so little knowledge of Kentico, but I'd like to try. I also see it as an "in" for me with Kentico, as it's something I've been meaning to get familiar with for some years. I'd normally read through documentation and watch tutorials, but time is against me.