To add the slider you have to download all the files from Themeforest ; you’ll find a Sliders Export compressed file, extract it and find the slider for the demo you imported.
Open the Admin Panel -> Revolution Slider -> Import Slider and add the file of the slider you found earlier and it should appear normally on your home page. If you have any trouble doing that, please send your Admin Credentials in a private reply and I will assist you.
If you want to remove the slider from the page, go to Edit Page and remove the first block that contains the shortode for the slider.
Hope this answers your questions