How to Change Your EBAY Store Featured Items Photos

Qiuet how to tutorial on how to add / change your stores featured items. I am doing a Christmas is July sale so I changed my items to those with holiday theme. I do like to keep a theme, season, or just color scheme to make first photos look nice and inviting.
Please visit my store.
https://ebay.com/usr/charmelicious
Leave your store in a comment so I can see what you sell too.
Thanks!