To promote a different user to be the moderator, first click the participants icon in the top left corner of the Virtual Classroom meeting window.
This will bring up a list of participants. Click on any participant name, then click Promote to moderator.
In Virtual Classroom meetings, the meeting moderator can also make another participant the presenter. All presentation features will be available to the new presenter.
To make yourself the presenter again, select your own name and click Make presenter.