send welcome_email by function

Hi thx for this nice plugin …. I want to send the welcome email not only when user register but when i click a button on the user panel in backend
maybe the user lost the firts mail with important infos.
.. tried many ways can you help me to trigger the “welcome email ” by php in other section of the site ?

function send_welcome_email($user_id) {
    // Check if the BNFW class exists
    if (class_exists('BNFW')) {
        // Instantiate the BNFW class
        $bnfw = BNFW::factory();

        // Check if the BNFW object is successfully created
        if ($bnfw instanceof BNFW) {
            // Call the method to send the welcome email
            $bnfw->welcome_email($user_id);
            echo "Welcome email sent to user with ID: " . $user_id;
        } else {
            echo "Failed to instantiate BNFW object.";
        }
    } else {
        echo "BNFW class not found.";
    }
}

// Usage example: Send welcome email for user with ID 1
$user_id = 777;
send_welcome_email($user_id);