press the arrow in the circle to go to the next slide, press the number '1' ( which is in the yellow circle ) to go to the first slide, click on number'2' to go to the second slide and '3' to go to the third slide, this is very easy to make,there will be lots of scripts in the backdrop/background page
I would like to thank a person who made a slideshow in the examples page he/she has given me the idea to make slideshows and improve them