Is there a way to set up a 2-step opt in with PopUp Pro or

Is there a way to set up a 2-step opt in with PopUp Pro or another plugin? I want to have the popup show when someone clicks a button. I'll be using Mailchimp or GetResponse. I did find this answer: https://premium.wpmudev.org/forums/topic/is-there-a-way-to-display-the-popup-only-when-the-user-clicks-a-button But don't see the Add-Ons mentioned there.

Thanks.

Christy