If you don't have the book, you can buy it from Amazon through the above link. It can also be read online or downloaded as a PDF at TruthUnity.net (Click Here). That page also has links to annotations that will be used in discussions. Commentary recordings by Vera Tate Dawson based on these annotations for each chapter can be found by Clicking Here.
This webcast uses Google Hangouts, a free video chat service through Google. Anyone can watch, but to participate by posting questions and comments, you need to have a Google account. Sign in to your Google account, then click the "Be part of the conversation" link that will appear in the video window when the webcast begins. This will open the video in a new tab with a Q&A sidebar where you can submit questions/comments.