Add Whatsapp Icon to header

Hello guys! I love your theme!

I’m trying to add a WhatsApp icon to my website’s header, I have followed these steps: https://kriesi.at/support/topic/insert-code-above-in-social-links/

I’ve already imported the fontello.zip files and added this to the Child Theme’s function.php file:

function avia_add_custom_icon($icons) {
$icons[‘whatsapp’] = array( ‘font’ =>’whatsapp-font-icon’, ‘icon’ => ‘ue800’);
return $icons;
}
add_filter(‘avf_default_icons’,’avia_add_custom_icon’, 10, 1);

// Add new icon as an option for social icons
function avia_add_custom_social_icon($icons) {
$icons[‘Whatsapp’] = ‘whatsapp’;
return $icons;
}
add_filter(‘avf_social_icons_options’,’avia_add_custom_social_icon’, 10, 1);

//Add items on the social share section
add_filter(‘avia_social_share_link_arguments’, ‘avia_add_social_share_link_arguments’, 10, 1);
function avia_add_social_share_link_arguments($args)
{
$new_array = array(
‘whatsapp’ => array(
“encode”=>true, “encode_urls”=>false, “pattern” => “whatsapp://send?text=[title]-[permalink]”
)
);

return array_merge($new_array, $args);
}

It is not woking . Can you please help me? I’m providing you an admin access on private content section.
Also, I will need to add a Trip Advisor icon later.
Thank you!