Changing Images on the Featured Slider

Hi! I have the FREE version of Clean Magazine. I want to utilize the Featured Slider but can't for the life of me find out how to change the images? Is the DEMO just that, a demo where you can't put pics in. Does it just pull the image from the 'Page' you put in there? I can't just put an 'image' per se in there? I'm also trying to have the image full all the way across and not just the center... I'm not sure if this is all doable in the free version. Help? Thank you so much. Kirk