Hello, Kelly,
Thank you for contacting us and for using XStore.
Please provide URL of your Home page and screenshots of the images you want to change.
You can use Lightshot screenshot or Gyazo tool to make screenshots and share the links here, or you can use a file sharing service such as WeTransfer https://wetransfer.com/ to upload ready images there and provide us with URLs.
Kind Regards,
8theme team