Custom social icon

Hi!
I read this thread: https://kriesi.at/support/topic/custom-social-icon-spotify/
Which probably has the answer I’m looking for, just I don’t know how to use it.
I added the code:

function avia_add_custom_icon($icons) {
  $icons['spotify']  = array( 'font' =>'entypo-fontello', 'icon' => 'ue907');
  return $icons;
}
add_filter('avf_default_icons','avia_add_custom_icon', 10, 1);

function avia_add_custom_social_icon($icons) {
  $icons['spotify'] = 'spotify';
  return $icons;
}
add_filter('avf_social_icons_options','avia_add_custom_social_icon', 10, 1);

To functions.php, but nothing new appeared on the drop-down of “Social Profiles” tab…
BTW I’m looking to add Yelp, not Spotify.
Thanks!