How you add a new image/slider for the front page slideshow?
Main Slider List Page
Add/Edit screen for the Front Page Slideshow, Slider type option selected by "Featured Content" , under the query settings post type selected by "Post" and selected taxonomy types "Reference".
Add new Slider, Go to Post list and filter by category "Reference".
Add New Post, For Example: Add new Slider for Veliline Site, Enter Title "Veliline", Add content in the Content Area, Select Category - Reference and finally add featured image