WP header images not working with ColorWay theme, any solution?

Hi,

I am new to WP, not to mention coding. I am using ColorWay theme and WP header images plugin to add custom header images for each page or category, for example. I upload the images but they don’t show up. Is there some simple code I can add to my headser.php or something?

My site:https://www.silverzine.net/

Thanks a lot,
Sanda

https://www.ads-software.com/plugins/wp-header-images/