Hey there all!
So let’s touch on a few things and see if I can’t get some misconceptions cleared up.
The project file that @JCarson is using in his example is the sample one that comes with RapidWeaver, which originally shipped in RapidWeaver v6. This project file uses only the standard page styles, and doesn’t have any Stacks-based pages in it. The pages in particular that @JCarson is dealing with are styled text pages.
Since there are no Stacks-based pages this also means Animagic is not a part of the discussion, so we’ll leave that at the wayside.
The images are just plain image files, nothing special about them really. They were some stock images I edited into circles in some photo editing software and dragged-and-dropped onto the Styled Text page(s). You wouldn’t edit the images as much as just remove them from the page and replace them with your own via drag-and-drop.
To be honest, you’re using a theme, so you don’t need that sample project file. Personally I would go ahead and just start a whole new project and that way you can use any page types you like as well as just insert your own content, images, etc without needing to adjust what is already there in the sample project. And heck, then you can use the amazing Stacks plugin by @isaiah to create some modular pages, which will make building things way easier!