We use Slider Revolution, one of the most powerful plugins for creating slider, so we have included some demo slider in the theme.
To import slider, go to WordPress Dashboard > Slider Revolution, click on Import Slider and then a pop-up window will be open.
In the opened window, select your preferred slider file for a demo, then click on “Import Slider” and wait until the import is complete.
Note: You will find the zip file of each slider at DummyContent folder in theme package.
You may have an error from Slider Revolution while the slider is completely imported in Front-End. There is nothing to be worried about, go to the page Back-End and set Slider again.
Slider Revolution Documentation