<!-- Add this to your settings page -->
<tr valign="top">
    <th scope="row">Reset Password Page</th>
    <td>
        <?php
        $reset_page_id = get_option('subscription_reset_password_page', 0);
        wp_dropdown_pages(array(
            'name' => 'subscription_reset_password_page',
            'show_option_none' => '-- Select Page --',
            'option_none_value' => '0',
            'selected' => $reset_page_id,
        ));
        ?>
        <p class="description">Select the page where you have placed the [subscriptionsystem_forgot_password] shortcode.</p>
    </td>
</tr> 