The Button Panel will not be active and contain only the Jump to Slide Action. Select the slide you want this button to jump to.
The slider switch marked Thumbnail size will let you scale the slide image within the button box.
You can stylize the button with gradients, textures, bevels and shadow.
Once you have created a button style you like you can save it as a graphic for reuse. copy and pasting buttons lets you create navigation arrays which you just go back to and select the slide or slide index you want the button to control. You can save an entire array as a graphic or incorporate it into a template for further reuse.
Here is an example of s movie using Slide navigation