Adding a strength meter to Password Fields
If you want to add a strength meter to a password field, you can add the display_force flag to its attributes array.
Here is a snippet:
add_filter('wp_ultimo_registration_steps', 'add_strength_meter');
function add_strength_meter($steps) {
// Add the flag to the user_pass field
$steps['account']['fields']['user_pass']['display_force'] = true;
return $steps;
}