What is the Wrinkle Prevent setting and how do I use it?

The Wrinkle Prevent setting helps keep wrinkles from forming when you cannot unload the dryer promptly at the end of a cycle. Press the Wrinkle Prevent button to get up to 120 minutes of heat-free, periodic tumbling at the end of a cycle. You can stop it anytime by pressing Wrinkle Prevent or opening the dryer door. (Page 24)