You will need to have Featured Content Gallery installed and set up on your website first.
If you would like to hire me to do that for you, please contact me.
Featured Content Gallery can be a bit confusing. It is a slideshow set up the shows featured posts with images that you select on your home page, depending on how you have set that up.
This video assumes you already have it set up, and need to see how to add more images or start adding images.