You can make the image slideshow to play automatically or manually.
To set the autoplay:
1. Click on the image slideshow element and click Style
2. Click on the wrench or settings icon
3. Set the Autoplay to Yes, you can also adjust the delay before the slide will show another image. And stop the autoplay when the mouse is hovered over the image slideshow.
To add a Transition simply select any of the options.