Hi,

(OrionThemes) Revolution slider widget is used only to display a slider. To create/edit a slider go to
Revolution slider settings, located in the WordPress dashboard. There is an extensive documentation on Revolution slider available here: https://www.themepunch.com/revslider-doc/first-steps/ and also video tutorials here: https://www.themepunch.com/faq/slider-revolution-beginner-video-guides-tutorials/

This should help you get started.

Kind regards,
Timea