Hi there,

Thank you for your message.

Before you can add the image slides you have to enable the "Front Page" template for the homepage. You can do this by editing your homepage (not in Elementor mode but just the quick edit). Please see attached image.

Then you can add the image slides by following these steps: 

https://docs.qreativethemes.com/docs/thermen/slider/

Hope this helps, let me know if you have any questions!