Confused with the Origami slider

I’m really feeling foolish asking this as it’s probably a very simple thing. I’m new to WordPress and have been handed the task of updating the website. I have some knowledge of the build and edit process but I am no means a web developer. The site was recently changed and I’m having difficulty with the Home Page slider. There are no galleries active on the site so I’m not sure where to load the new images or edit the old ones. I’ve walked myself through pretty much most other things and once I discover this piece of info, I’ll get it too. So simple as I’m sure it is.
Thanks,
Caroline