• Show one time (even if not submitted sucessfully) (default): opens once per browser after page load, then never again automatically.
• Show every time pages loads: opens on every page view until the visitor submits the form.
• Show when triggered (Footer button click): never opens automatically; visitors use the Sign Up for our Newsletter button in the footer.
• Dont Show: disables the popup and hides the footer button.

Changing the behaviour value resets the 'already shown' memory in visitors' browsers, so switching from Show one time to another option and back re-shows it. Visitors who already subscribed see the message You are already subscribed! when they click the footer button.