Make sure your microphone has permission in the browser. When asked if you want to view the sound graph saved in the lists or record a new graph? Type "record" or "view." If recording, make sounds and watch to see them graphed on the screen. Click the green flag again and choose view to see your recorded sound graph recreated.
Note: No sounds are recorded or stored on our servers; but this program stores the x and y position of the dot sprite in the sound plot lists, so the sound graph can be viewed again later. You can also use the list stage monitor features to export and import lists saved on your computer (right-click on the lists visible on the stage to find those options).