SGARS is using Google Meet which is part of the Google business suite of tools (known as G Suite). There's a link to Google's support information at the end of this article.
There are several ways to join in. The easiest way to enjoy the full experience is seated comfortably in front of a computer with a video webcam, a microphone and speaker. The microphone and speaker could also be a USB audio headset. A video webcam is only needed if you wish for the meeting to be able to see you.
You can use a computer with no audio or video to simply view the presentation and dial in via telephone to listen and speak.
We've gone with this particular conferencing option as it provides the most flexibility by also providing a telephone dial in.