Please note: the reminder can only be sent 5 minutes before the webinar.
To enable FB reminder, first of all, go and edit your webinar
Click on Scheduling in the menu
Then in Easy - Scheduling, scroll down, in Webinar Reminders section, find Stealth Facebook Reminders, and check that option. You should now see something like this
Here is a quick video on how to Link Facebook Pages
After you are done adding your page, go to Customize menu.
Scroll down until you find 5-Minute Facebook Reminder
Click on configure and edit the message to what you want. Please make sure not to change the webinar link custom field. Once you are done, hit Save