Gallery has no slideshow option

Hello, I have created a gallery here:
http://deathless.it/lab/icpietratest/?page_id=8

I think clicking an image should start a slideshow where you can browse through all the images, instead it just opens the image itself in the browser.

Also, there are no options in the gallery I created to change gallery type, and if I change with a shortcode such as type=”slideshow” nothing happens.

So, can anybody help me about this?