To set a slideshow to advance manually:
Double-click the button for the slideshow in the DVD menu to open the slideshow editor.
Choose Manual from the Slide Duration pop-up menu.
If you want to display right and left arrows on the slideshow, click the Settings button (shown below) and select “Display navigation arrows.”
These arrows are not functional navigation tools; they act as a visual reminder to the viewer to click the Next button on the remote control to advance to the next slide.
When you are finished, click the Return button to exit the slideshow editor.