mailto is a Uniform Resource Identifier (URI) scheme for email addresses. It is used to produce hyperlinks on websites that allow users to send an email to a specific address without first having to copy the email address and enter it into an email client.
1. Click on the button element and click Style
2. Click on the settings or wrench icon and set the Action type to Open URL
3. In the URL field enter mailto:firstname.lastname@example.org
Note: change the "email@example.com" to your preferred email address.