1. Click the Theme Options on admin menu.
2. Scroll at the end of Basic Settings
2. Find field Coming Soon and click the ON / OFF button to enable or disable.
3. Next set date in filed Coming Soon Date.
Click the Save button to implement the new settings.
Note: The Coming Soon will not be available if you are logged in as admin in your site, you will have to log-out or open the site in Incognito Mode.
Title and description you can change in Appearance → Widgets. Find Comingsoon sidebar and change the widget on it. You can also publish different type of widgets if you like.