To edit the hero image on the homepage please go to the Pages tab and edit the homepage in Elementor Page Builder.

1. Click the top left icon of the row
2. Click on the “Style” tab
3. Click on the image to select/upload your own image
4. Select or upload your image to the media library window
5. Save the page

To create a background image slideshow you can select the “Slideshow” button and upload your images to the setting below: