Log in to CampusGroups.
Manage your group.
Click on the 'Files' menu and then on 'New Folder'.
Create a folder named 'Slideshow' and upload all the images into it.
Click on the 'Website' menu and then on the 'Colors & Graphics' tab.
Select the 'Slideshow' folder under the 'Insert a slideshow instead of a static image:' dropdown.