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