Add Meta tag

Hey Charlotte :)

Please refer to this post – https://kriesi.at/documentation/enfold/add-custom-js-or-php-script/#add-a-script-to-head-section

//-------------------------------
// Custom script in head section
//-------------------------------

function custom_script_name(){
?>
<meta name="agd-partner-manual-verification" />
<?php
}
add_action('wp_head', 'custom_script_name');

Cheers!
Yigit