Theme Horse

Hi YAN,

We recommended not to change the code because if you change the code then while updating to our new version all your customisation code will be lost. So better make child theme and first unhook the functions and the edit the code.

http://codex.wordpress.org/Child_Themes

The font is enqueued form theme folder-> inc-> functions-> functions.php on line no 67. You can see this below code
wp_register_style( 'interface_google_font', '//fonts.googleapis.com/css?family='.$interface_google_font_load .':400,700italic,700,400italic');

Thank you!