Settings: Timed Reveal
Megaphone pages that have a countdown timer widget (such as Classy Webinar or Webinarly) make it simple to set the countdown point.
In the Megaphone page editor left sidebar, click "Countdown Timer":
Click the date input to bring up a calendar and time select. Here you can see a setting for Feb 14 at 12:00PM Pacific Time. Make sure you pick the date and time your webinar starts. You can pick your timezone from the dropdown to make setting the time easy for you (we tend to think in our local timezone).
Click "Done" and "Save" to finalize the time. Your countdown timer and target date are automatically updated. Note that our countdown widget pulls the timezone from the browser of the page visitor, so the countdown time and target time should match the local timezone for your visitor.