@mmc5508 , the way Canvas Conferences is set-up, there isn't a way to add someone to a conference after it's started. If your Instructor needs to be able to view the conference then you would need to find a tool you can use to record the conference. For example, you could use something like Screencastify Screen Recorder for Chrome or Screencast-O-Matic (they are free) to record the conference and then share it with your teacher. There is a recording limit on how long you can record, but you could make multiple videos if needed and just share all of them with your teacher.
Hope this helps! Kona