Editing a plugin browser

Hi,

I began editing and updating a website that someone else had built. There is a plugin banner on the homepage that cycles through a set of images. When I upload an image on the main content part of the page, it automatically uses that image on the banner cycle as well. How do I make the images uploaded into the main content of the page not also appear in the banner cycle?

The link to the website for reference is: http://guadalupeschoolslc.org/

help please!