добавить данные по клику на кнопку в базу данных

$db_host = 'localhost';
$db_user = 'root';
$db_pass = '';
$db_name = 'db_name';

$conn = mysqli_connect($db_host, $db_user, $db_pass, $db_name);
if (!$conn) {
    die ('Failed to connect to MySQL: ' . mysqli_connect_error());   
}

$sql = 'SELECT * 
        FROM users';
        
$query = mysqli_query($conn, $sql);

if (!$query) {
    die ('SQL Error: ' . mysqli_error($conn));
}

echo '<table>
        <thead>
            <tr>
                <th>Name</th>
                <th>Position</th>
                <th>Office</th>
                <th>Age</th>
                <th>Start date</th>
                <th>Salary</th>
            </tr>
        </thead>
        <tbody>';