[Theme Horse Support Team]

@jbedel,

Yes you need to purchase the single license from here to use the Revolution Slider and just go to Appearance -> Customize -> WP Portfolio Pro Theme Options -> Slider Options and set the slider option accordingly and go one step back and you will see Featured Post/Page Slider, Featured Image Slider and Revolution Slider option go to the specific slider type that you have choose from Slider Option and click on publish button.
If you are still confuse to set the slider just contact to our support team member here so that they will set the slider into your site as well as teach you how to set the slider.

Thank you!