I have used and included Revolution slider http://codecanyon.net/item/slider-revolution-responsive-wordpress-plugin/2751380 (extended license was bought by me, permits you use only with this theme.) with this theme because it is very powerful and at the same time really easy to use. During the installation of theme you should have already installed Revolution Slider plugin. If you haven't, please go to Appearance -> Install plugins to install and activate it.
If auto install worked, that means you had the slider imported. To edit the slides, please go to wp-admin/revolution slider and then Click on the slider.
Documentation from plugin author is included in Documentation/other-documentation folder together this file.
Note: If auto install is not successful, you can find the slider import file in MAIN-THEMEFOREST-DOWNLOAD\Resources\import-data\revsliders