Have you remembered to register before the event, and received an email with the link? (please check your junk/spam folder)
If you have been unable to access from the start this will be because the webinar is at full capacity, so make sure you get in quick.
If you had access to this but no longer do please simply try and refresh the link again.
If you are unable to join the webinar it will be available in the webinar archive section on Samuel365 soon after.