The html email editor offers 3 menu's on the right side of the screen. This article is about Content; adding an button.
To add a button, from your HTML email editor, click and drag the image icon from the right to a block in the canvas.
You can select the button text to change text and text styles:
Next, take a look at the button settings in the right-side panel. From here you can edit your button, add your call to action, and the URL of the page where you want your clients to go on the right-side panel. Please add the complete url to make it work, eg: https://www.getshaman.com
Other notable settings in the right side panel:
Rounded border: create rounded corners of the button
Padding inside button: change size of button
Padding outside button: change space around the button
Watch the video below to learn more.