@Tammy: Are you using Full Frame Free version.
If you want to remove it then you can go to “Appearance => Customize => Featured Slider Options => Featured Slider Settings” and in “Enable Slider on”, you need to select “Disabled”.
But if you want to replace that with your own images. Then in Free version you have option to replace that Demo Slider Image with “Featured Page Slider. For then you can go to “Appearance => Customize => Featured Slider Options => Featured Slider Type” and select “Featured Page Slider”. Then select the pages which you want to show as slider image. This is will take Featured image, title and excerpt text of that pages you have select. That’s why don’t forget to assign Featured Image http://catchthemes.com/blog/videos-blog/video-series-adding-featured-image-wordpress-postpage/. For more check out theme instructions page at http://catchthemes.com/theme-instructions/full-frame/
Note: You have option to use Image Slider or Post Slider or Category Slider or Page Slider in Pro version. There are other additional features in Pro version. You will find the list of additional features in theme instructions page of pro version at http://catchthemes.com/theme-instructions/full-frame-pro/