In your control panel in the Training section -- Created Trainings -- the green "Actions" button in "Booking Page" will take you to the link or the detail page of that training.
If you enter through www.classonlive.com that link contains the word classonlive in the url, for that link to appear with your domain or subdomain, you must access it through these means.
NOTE: See here examples of landing pages / detail pages.