1. The image is massive, so size it down to say 300px wide for web use.
2. Since you want the logo and the text title, we’ll need to edit header.php. You’ll want to copy it over to a child theme to make the alterations:
https://startupwp.com/topic/child-theming/
3. Just under <div id="site-title"> in header.php, add:
<a href="http://voicemarkstudios.com/" id="logo-icon"><img src="http://voicemarkstudios.com/wp-content/uploads/2014/01/Voice-Mark-finished.png" alt="VoiceMark Studios" /></a>
4. Add the following CSS:
#logo-icon{height:54px;margin-right:10px;float:left}