Teachers and students simply need to install the extension to set up devices for wireless screen sharing. The teacher sets up Cast on the computer that's connected to the classroom projector and then invites a student to cast their screen. The student casts their screen to the teacher's computer and the teacher can then project the screen to the whole class.
If you need step by step directions for running the extension for the first time, I encourage you to check out this post: https://eduk8.me/2016/11/how-to-use-google-cast-for-education
Watch this video for support:
