Login to your dashboard and Go to Appearance > Theme Options > Featured Post/Page Slider Tab > Slider Options there you will see the select slider type option select Revolution Slider and Save it then at the bottom there you will also see the revolution slider options choose your slider from the drop down box and save it.
You can also see the screenshot to set the revolution slider.
We have spend lots of time and efforts to develop this theme available free/premium for all.
Could you also please help us rating this theme in WordPress Repository. https://wordpress.org/support/view/theme-reviews/ultimate
We really appreciate your rating.