Hi Elena,
Sorry for that. There is a slight difference in experiences seen between Organizers and Registrants of GoToWebinars, where Orgs can send themselves the Attendee invitation template via email, and publish them through several different media options-- but there is not an 'add to calendar' option on the Manage Webinar page.
Attendees on the other hand, do have the ability to add a GoToWebinar confirmation to several different calendar types after registering.
You will likely receive a reminder email from the system which you can then add to your calendar manually if you like. This reminder will have your Organizer join link inside with instructions etc.
