On the home page of my WordPress website I am trying to replace the default pictures of a slideshow. It has an interface where it shows a magnified image or larger photo on the right side, while on the left it shows how many pictures are in it as thumbnails. I have used MSPaint and Gimp to resize the photos I wanted to the correct size of the magnified image and when I put it in, it's inputted as the image used for the magnified image and that part works well. The problem I have is that on the thumbnail off on the left side showing the images in the slideshow it shows a default small image stating that your image cannot be found and I do not know where to place it (if it does it separately as I should make two images, or it would automatically shrink the magnified image to fit in the thumbnail section.)