At this point, you can go to the following site. This will require you to login using your Google account. You can then update your profile, find friends, create hangouts, and start video parties. https://plus.google.com/
This is all you need to join a Google Hangout.
If there is a link posted on the CigarGeeks website for a Hangout already in session, you should be able to click the link and join the video chat. However, if you would like to initiate the video hangout, click the Create Video Party on the lower, right hand of the screen as seen below: