In order to create a Webinar Lesson, go to your Course.
Click on Add Content.
Then click on Add Lesson and scroll down to the different content format and choose Webinar.
You will then need to add the skill level, duration and how many hours before the lesson takes place.
Choose your date and time and whether the webinar will repeat.
Then choose if you'd like to have the lesson repeat.
When you've finished, press Save and Publish Lesson.