Sorry for the late reply.
You need to import the revolution slider file.
First you’ve to download it from here: https://themeforest.net/downloads ,Choose “All files and documentation”.
Once you download and extarct the files you will be able to find the slider export files ,choose any slider you like from our demos and import it at Rev.Slider in wordpress admin panel.
If you have any other questions please don’t hesitate to ask