how to replace a img in a rotator or slider from a bc template

I'm just trying to figure out how to replace the images from the template i chose from business catalyst especially the images with in the slider/rotator on the home page. Is this something I can do from with in BC or is this something I need to do from Muse or DreamWeaver? Hard to find info about this . It seems like this should be simple. I feel stupid.  thanks if you can help