Hello,
To set Slider follow below steps:
Step 1. Go to Dashboard >> play-school-kindergarten-pro Slider
Step 2. Click on Add New button
Step 3. Add the slider name.
Step 4. Add slider button link.
Step 5. Add the featured image as a slider.
Step 6. Click on ‘publish’ button at top right of page. And Enjoy the Slider.

Here is our theme documentation: http://luzuk.com/demo/play-School-Kindergarten/documentation/

Thank You.