Header call to action button
A "call to action" button can be set up for the header. This is displayed on the right side after the menu items. The CTA button is only visible to guests. Logged-in members will see their avatar with a user menu in it's place.
Configure the CTA button
To configure the button, navigate to Appearance → Customize in your WordPress admin panel, then click on Theme Layout → Header CTA and enable the "Show header CTA button" option.
How to find the icon class
Currently the only icon set that comes by default with the theme is Fontawesome. To find the icon class, visit https://fontawesome.com/ and search for icons from there.
Click on the icon you'd like to use and copy the class in the example.