Add Google Font to Enfold Theme

This comes to your functions.php of your child-theme:

add_filter( 'avf_google_heading_font',  'avia_add_heading_font');
function avia_add_heading_font($fonts)
{
$fonts['Kaushan Script'] = 'Kaushan Script';
return $fonts;
}

add_filter( 'avf_google_content_font',  'avia_add_content_font');
function avia_add_content_font($fonts)
{
$fonts['Kaushan Script'] = 'Kaushan Script';
return $fonts;
}

The plus sign in the font should not be here – than it will work

Dashboard – Appearance – Editor ( appearance is a drop down – if you only press Editor – you will open the first point – themes)
on the right side there will be a list of files / folders
there is a functions.php ( but be sure you are using a child-theme – even if you will manage to edit the file on parent-theme – changings will be lost on next update)

on a fresh child theme install there will be only:

<?php

/*
* Add your own functions here. You can also copy some of the theme functions into this file. 
* WordPress will use those functions instead of the original functions then.
*/

and – yes there is no closing tag at the end of that file

yes some people have plugins or in wp-config f.e. that line :

define( 'DISALLOW_FILE_EDIT', true );
which surpesses the editor