FASO does not offer a way to add a pop-up to your website. We feel that most people get annoyed by these pop-ups.

Your site visitor may also have pop-up blockers installed, preventing the popups from appearing. 

If you still wish to use a popup, you can use an off-site newsletter service like MailChimp and add their popup.

For more info, see this FAQ:
Mailchimp Integration /  Embedded Form ~ Subscriber Pop-Up

For more info on why not to use Pop Ups, please see these articles:

• Why I Don't like Email Newsletter Signup Pop Ups
  by Clint Watson
  Imagine this:  You walk into a high end art gallery.  You've heard about the great art in this gallery from a few friends.  Excited, you walk in and your breath is taken away by the first wall of paintings you see. You approach the wall for a closer look, and, just as you're getting interested.......a gallery associate appears between you and the painting and says:
  "Hi Art Lover!  Wouldn't you like to be notified weekly of great new art we have?  Become part of our gallery community.  Just fill out your name and email address here!  Or, if you don't care about art, I'll leave you alone."
  And then he just stands there waiting.  Oh, yeah, there's a little tiny "x" above his head.  If you press it, he'll leave you alone.
• Avoid intrusive interstitials and dialogs (popups)
  from google 09/09/2024
• Google on When It’s Acceptable to Use Intrusive Interstitials (popups)
  from Search Engine Journal - SEO, Search Marketing News and Tutorials, 7/28/202
• Google started punishing mobile sites that show hard-to-dismiss popups
• Why People Hate Newsletter Popups & Should We Really Use Them? Apr 6, 2020
• Don't use annoying pop-ups
• 4 Reasons Why I Don’t Use Pop-Ups

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