How can I turn off image/photo names in the slideshow?

You can shut off the image/media names and descriptions by editing the Design that is assigned to the tour, following these steps: 

1

Click on the  link in the top menu:

2

Find the design that is assigned to the tour, and click on the title of the design, or on the Edit link:

3

Look for the field under the Options section labeled Visibility of media name, description in player, and set the parameter to: Hide

4

Save the design settings by hitting Enter/Return on your keyboard, or by scrolling down to the bottom of the design settings and clicking on save