Hi Jason,
Thank you for writing in!
You can add target to your button using the target=”blank” attribute inside the button shortcode. Please note that it’s “blank” not “_blank”. So the shortcode would be like:
[button href="URL" title="Sign Up Today!" target="blank"]Sign Up Today![/button]
I would also suggest you to watch Button Shortcode Walkthrough video.
Hope this helps. If you have any further question, don’t hesitate to ask and we will be happy to assist. 🙂
Thank you.