Recommended article before setting up: Engage: Page Targeting
The Social Site lock is a great way to ensure visitors have converted to your newsletter or other lead form before being able to see the page contents. Use over any page, post, area guide or team member page. To create this call to action, select the Social Site Lock from the available list of CTA templates.
To use this call to action:
Set the appropriate text, font size, and colors
Choose an appearance, condition and position (see: Editing Your CTAs)
Choose a Lead Form (see: Understanding your Lead Forms
Choose a Submit Action (redirect url or confirmation message)