You can start your meeting up to 5 minutes before the time you scheduled it to begin.
1. Go to your “My Courses” page
2. Click on the name of the course for which you have a scheduled meeting
3. Inside the course, click on the “Manage Course” button and then “Meetings” in the menu
4. A “Start Meeting” button will display up 5 minutes before your meeting is scheduled. Once it’s been started, you and your students will see a green “ON AIR” icon display:
5. You can also use the “Student View” of the meeting page:
And you will see a “Launch Meeting” button that will become clickable 5 minutes before the meeting (this is also what your students will see and click on to join the meeting):
For more details on the entire meeting setup and features, you can check out this resource: Manage Course: Meetings