I have figured out how to load multiple images in Zen Cart but one of the images is duplicated on the screen. How does one go about deleting one of the multiple images?

Please note: I am an Apple person and have zero knowledge of all that fancy FTP stuff and computer lingo so it has taken me a while just to figure out what you were all talking about when using the tutorials for loading multiple images for one listed item. I figure if I can make it through that, I can make through more of this unintuitive program.

Please help.