First you need to import the xml files that we will provide if you want to.
Then set the home page as static. Go to dashboard > setting > reading > set static home page > select home page > save settings
You will see a slider like it is on our demo theme.
Or you may try adding featured images on the slider post by going to dashboard > sliders > add new > set title / description / featured image > publish
repeat the adding featured image process again and you will see the images sliding