The thread warns readers that the content might be removed by Twitter at any moment, emphasizing the need to save it as a PDF for future reference. It highlights the importance of following @ThreadReaderApp for updates and encourages users to mention the app when referring to threads they want unrolled. To use the unroll feature, users can simply tweet the app with the keyword "unroll" along with the thread link. The message also suggests practicing with the tool before diving into more complex threads and points readers to a help page for further guidance. The focus is on user engagement and making the process of accessing and sharing Twitter threads easier, ensuring that valuable information doesn’t get lost if Twitter deletes it.