You can do that by adding a gallery to your homepage and selecting “slideshow” as the gallery type.
https://moqsdotorg.wordpress.com/wp-admin/post.php?post=132&action=edit
You’ll find a full guide to adding a gallery and choosing the slideshow format right here:
http://en.support.wordpress.com/images/gallery/#adding-a-gallery-or-slideshow
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.
If you get stuck at any step, just let me know!