Recommended article before setting up: Engage: Page Targeting
The Email Alert Bar is specially designed to make it easy to encourage your visitors to signup to receive newsletter alerts, right on the top of your page! To create this call to action, select the email alert bar from the available list of CTAs.
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 )