Marci discusses the FS Clipboard feature within JAWS, demonstrating how users can gather and merge text from different parts of a document seamlessly. By utilizing keyboard shortcuts and commands, Marci showcases the functionality of the clipboard, emphasizing the importance of reviewing and manipulating text accurately. She provides a practical example of crafting a message about the qualities of a true friend, showcasing the flexibility and control the FS Clipboard feature offers for efficient editing and productivity when using JAWS.