Внесение значений в таблицу mysql из select и обратно

<form method="post" name="add_user">
<table>
<tr>
<td style="width: 230px">Сотрудник</td>
<td style="width: 150px">Должность</td>
<td style="width: 120px">Имя компьютера</td>
<td style="width: 130px">IP-адрес</td>
<td style="width: 120px">Логин</td>
<td style="width: 115px">Пароль</td>
<td style="width: 247px">Электронная почта</td>
<td style="width: 115px">Пароль почты</td>
<td style="width: 115px">Активность<br>да/нет</td>
<td>Добавить/Изменить</td>
</tr>
<tr>
<td><input type="text" name="Employee" value="<?= isset($_GET['red_id']) ? $product['Employee'] : ''; ?>"></td>
<td><input type="text" name="Position" value="<?= isset($_GET['red_id']) ? $product['Position'] : ''; ?>"></td>
<td><input type="text" name="Computer" value="<?= isset($_GET['red_id']) ? $product['Computer'] : ''; ?>"></td>
<td><input type="text" name="IP-address" value="<?= isset($_GET['red_id']) ? $product['IP-address'] : ''; ?>"></td>
<td><input type="text" name="Log-in" value="<?= isset($_GET['red_id']) ? $product['Log-in'] : ''; ?>"></td>
<td><input type="text" name="Password" value="<?= isset($_GET['red_id']) ? $product['Password'] : ''; ?>"></td>
<td><input type="text" name="Email" value="<?= isset($_GET['red_id']) ? $product['Email'] : ''; ?>"></td>
<td><input type="text" name="Email_Pass" value="<?= isset($_GET['red_id']) ? $product['Email_Pass'] : ''; ?>"></td>
<td><select name="Active">
<option value="Да">Да</option>
<option value="Нет">Нет</option>
</select>
</td>
<td align="center"><input id="checkbox" type="checkbox" name="checkbox" onchange="document.getElementById(' submit').disabled = !this.checked;" /></td>
 
</tr>
</table>
<input name="Send" type="submit" value="Отправить" disabled="disabled" id="submit"></td>
</form>
<div class="row">
<div class="container">
<div class="form-group">
<input border=1 type="text" class="form-control pull-right" style="width:20%" id="search" placeholder="Поиск по таблице">
</div>
<br><br><br>
<table class="table table-striped" id="mytable" cellspacing="0" style="width: 100%;">
<thead>
<tr>
<td align="center" style="width: 230px"><b>Сотрудник</td>
<td align="center" style="width: 150px"><b>Должность</td>
<td align="center" style="width: 120px"><b>Имя компьютера</td>
<td align="center" style="width: 130px"><b>IP-адрес</td>
<td align="center" style="width: 120px"><b>Логин</td>
<td align="center" style="width: 115px"><b>Пароль</td>
<td align="center" style="width: 247px"><b>Электронная почта</td>
<td align="center" style="width: 115px"><b>Пароль почты</td>
<!-- <td><b>Удаление</td>
<td><b>Изменение</td> -->
</tr>
</thead>
<tbody>
<?php
$sql = mysqli_query($link, 'SELECT `ID`, `Employee`, `Position`, `Computer`, `IP-address`, `Log-in`, `Password`, `Email`, `Email_Pass`, `Active` FROM `users`');
while ($result = mysqli_fetch_array($sql)) {
if ($result['Active'] == "Да") {
echo '<tr bgcolor="green">' .
"<td>{$result['Employee']}</td>" .
"<td>{$result['Position']}</td>" .
"<td>{$result['Computer']}</td>" .
"<td>{$result['IP-address']}</td>" .
"<td>{$result['Log-in']}</td>" .
"<td>{$result['Password']}</td>" .
"<td><a href=mailto:{$result['Email']}>{$result['Email']}</a></td>" .
"<td>{$result['Email_Pass']}</td>" .
"<td>{$result['Active']}</td>" .
"<td><a href='?red_id={$result['ID']}'>Изменить</a></td>" .
'</tr>';
}
else {
echo '<tr bgcolor="red">' .
"<td>{$result['Employee']}</td>" .
"<td>{$result['Position']}</td>" .
"<td>{$result['Computer']}</td>" .
"<td>{$result['IP-address']}</td>" .
"<td>{$result['Log-in']}</td>" .
"<td>{$result['Password']}</td>" .
"<td><a href=mailto:{$result['Email']}>{$result['Email']}</a></td>" .
"<td>{$result['Email_Pass']}</td>" .
"<td>{$result['Active']}</td>" .
"<td><a href='?red_id={$result['ID']}'>Изменить</a></td>" .
'</tr>';
}
}
?>
</tbody>
</table>