To change the embedded font, find in the page head link tags.
<link href='http://fonts.googleapis.com/css?family=Dancing+Script:400,700|Open+Sans:300italic,400italic,600italic,700italic,400,300,600,700' rel='stylesheet' type='text/css'>
To change the font, first go to Google Fonts, choose a font and replace the code above with the generated code.
Next find the _base.less file in the css/less directory.
At the top of document replace font name with your current one.