Copy the contents of the "upload" folder to your store's top level directory, preserving the directory structure. This will not overwrite anything as they are all new files.
Log in to your store's administration and, from the menu, select "Extensions->Modules", then click the "Install" link in the "Action" column for the "Showcase" module. You may then edit the module to enable it, set it's position and sort order, select whether to use all products, or featured or specials. You can also set the timer interval between fades.