Hi there,
Go to Appearance > Customize > Slider Options > Slider Options there you will see the “Select Slider Type” option just choose “Featured Post/Page Slider” or “Featured Image Slider” then publish and refresh the page and set the sider status, text position, number of sliders and other transition effects.
Now go to Appearance > Customize > Slider Options > Featured Post/Page Slider Options or Featured Image Slider Options to set the slide.
Thank you!