If the dropdown menu below shows more than just a single entry (each entry is for a separate web page), you need to use the < and > buttons below to go backward/forward one web page at a time. Pressing 'Autoplay' will do this for you automatically, pressing 'Stop' returns you to manual mode. Note that if you are autoplaying, landing on a 'video' page will automatically set the slideshow to manual mode [this is to allow the clip(s) to fully play through].