To change the slider image:
1) Edit the appropriate “Slider Page”
2) Remove current “Featured Image”
3) Crop new image to 1024px X 350px
4) Upload new image & select as “Featured Image”
5) Refresh home page and new image should appear. If not, clear your browser cache.
To store/archive slider images simply edit the appropriate “Slider Page” and upload a cropped (1024px X 350px) image to the page. To use this image as slider image, open gallery under the media icon, find the appropriate image and set as featured image. Update to save your changes.