Once you’ve added the slideshow, it’s possible to remove the default black background with some custom CSS, so it blends into the page more. Just let me know if you go this route and need any help with the code.
Once you’ve added the gallery, be sure to select the slideshow option in this step:
Type: Specify the type of gallery here. The options are a default gallery of thumbnail images, a gallery with rectangular tiles, a gallery with square tiles, a gallery with circular tiles, or a slideshow.