Wordpress Topbest theme - slider problem

I chose wordpress Topbest theme for my website but I couldn’t implement slider in homepage.
When I open dashboard,there is “slider option” in left side bar but when I click on that slider.php comes in form of posting editor,I confuse that where should I upload my images for slider.

Plz give me suggestion for implementing slider for my home page.

You can see this theme here : demo.themesmarts.com/topbest