In addition to the Slideshow module you now can use the Carousel module. Watch this video to see how it works.
The video explains how to use the Carousel module and how to add pictures and other content. If you want to delete a slide in the Carousel module, delete all contents of this slide. After closing and reopening the page editor, all empty Carousel slides will be removed. The Carousel only shows slides with content. Website visitors will not see a blank slide; if there are any, these will simply be skipped.