You can join a class video meeting after the teacher starts the meeting.

To use Meet, you have to sign in to Classroom with a school account. Your account looks like studentlogin@stisidore.org

  1. Open the Google Classroom app "".
  2. Tap the class.
  3. Choose an option:
    • At the top of the Stream or Classwork page, tap Meet Add video meeting.
    • On an announcement or post, tap the video meeting link.
  4. (Optional) To allow Meet to use your camera and microphone, tap Allow.
  5. Before you join, at the bottom, make sure you’re signed in with your school account. If you need to switch accounts, tap Switchand thenselect the Classroom account.
  6. To join the class video meeting, tap Join meeting.


Taken from: https://support.google.com/edu/classroom/answer/9777280