Pre-register for any class by clicking on "Sign up" for any class. You'll receive a confirmation email from 'FitGrid' shortly after you sign up.
Then, 45 minutes to one hour before your class you'll receive another email with a link where you will join the class by clicking on the STREAM CLASS button in that second email. The STREAM CLASS button will launch Zoom for your class automatically.
If you can't find the 'FitGrid' email do a search for 'FitGrid' in your email.