There are a few things you need to do in order to get Roomba to map a room: 1) Place Roomba in the middle of the room that you want it to clean. Make sure that there are no obstacles in the way and that Roomba has a clear path. 2) Press the "Clean" button on Roomba's control panel. 3) Once Roomba begins cleaning, it will start creating a map of the room. It will continue cleaning until the entire room has been mapped out. 4) Once Roomba is finished cleaning, you can view the map it created by pressing the "Map" button on the control panel.