I am using wordpress theme MN Flow and I want to change the title font. I looked in page source and it shows that the theme is using google font but I want to know how and where to change that. The style.css file that shows in WordPress theme Editor is blank.
The google font style sheet given in Page source is
<link rel='stylesheet' id='open-sans-css' href='//fonts.googleapis.com/css?family=Open+Sans%3A300italic%2C400italic%2C600italic%2C300%2C400%2C600&subset=latin%2Clatin-ext&ver=3.9.1' type='text/css' media='all' />