Hey Adriana! Welcome to the Unbounce Community!
If you’re just Previewing your page, you won’t be able to use the email button functionality. Once you hit Publish, you’ll be able to test it out.
Additionally, if you’re wanting users to send you an email, you can always add a button with the CTA saying “Get In Touch” (or something to that effect) and adjust the settings to open an email. Here’s a screenshot of what you should see when you’re in your Button settings. The email address that you want to receive these emails in should go where that red box is. Also, be sure to include mailto:
That’s just another option. If you run into any other snags along the way, feel free to chime in here.