Hello There,
Thanks for writing in!
Because this requires a template change, I’d advise that you setup a child theme. This allows you to make code changes that won’t be overwritten when an X update is released.
Then add following code to child theme function.php file:
add_action('admin_head', 'show_favicon');
function show_favicon() {
echo '<link href="FAVICON IMAGE URL" rel="icon" type="image/x-icon">';
}
Note: Replace FAVICON IMAGE URL in above code with the URL of your favicon image.
Thanks.