controlling slide show speed in nextgen gallery

Hi,
I just setup a nextgen gallery for a client here:
http://iworshipgtm.com/photos-videos/nggallery/thumbnails

I chose the option that allows the user to pick a slide show or gallery view. when I click slideshow it shows the first image but doesn't switch. does it seem to switch from image to image for you? Also where do I go to control the speed of the slideshow?