1. On the lesson page, click on "Request Permissions"
   
   
   
2. Then in the pop-up click “Allow”.
   
   
   
3. After that, click on "Knock” and wait for the teacher to let you into the classroom
   
   
   
   

If it still doesn’t work

1. If you keep seeing the "Try again" screen.
    
   
   
2. Go to the main screen of the smartphone. Go to iPhone settings. 
   
   
   
3. Swipe down to bring up the search bar in settings.
   
   
   
4. Type "Chrome" and click on the item with the Safari icon.
   
   
   
5. When you get to the Chrome settings page click the “Camera” and “Microphone” slider. It should turn green.
   
   
   
6. Switch back to the Chrome app.
   
7. There should be a lesson page.
   
8. If not, then go to the place where the link to the lesson was sent to you and go through it.
   
   
9. On the lesson page, click on “Try again” or "Request Permissions"
   
   
   
10. Then in the pop-up click “Allow”.
    
    
    
11. After that, click on "Knock” and wait for the teacher to let you into the classroom