Open your page then click on the Page Builder tab.
Select the webinar pages option and choose from one of the available webinar templates. Edit the template according to your needs for the date, title, presenter names, etc.
You can use the templates to play a pre-recorded video or stream a hangout, or you can use GoTo Webinar.
For GoTo Webinar, when you create your webinar on that platform you are given a URL to send people to to register. In that URL you need to take note of both the host name (will be www1, www2, etc) and the webinar ID. This information gets entered into the appropriate fields on the template.
You can also use your autoresponder form code here to capture people’s email addresses when they register for the webinar.