Subscription Custom Form not appearing

I’ve just downloaded the plugin, very useful and elegant, but I’m having an issue while customizing the subscription form.

I’ve copied the content from the List Building > Subscription > Form Code and put it under List Building > Subscription > Subscription Page Area > Text Editor, but its not applying any of the Custom CSS Class I’m implementing.

Kindly let me know, am I doing something wrong?

<script type="text/javascript">
    //<![CDATA[
    if (typeof newsletter_check !== "function") {
        window.newsletter_check = function(f) {
            var re = /^([a-zA-Z0-9_\.\-\+])+\@(([a-zA-Z0-9\-]{1,})+\.)+([a-zA-Z0-9]{2,})+$/;
            if (!re.test(f.elements["ne"].value)) {
                alert("The email is not correct");
                return false;
            }
            for (var i = 1; i < 20; i++) {
                if (f.elements["np" + i] && f.elements["np" + i].required && f.elements["np" + i].value == "") {
                    alert("");
                    return false;
                }
            }
            if (f.elements["ny"] && !f.elements["ny"].checked) {
                alert("You must accept the privacy statement");
                return false;
            }
            return true;
        }
    }
    //]]>
</script>
<div>
    <form action="https://www.mydomain.com/?na=s" method="post">
        <table border="0" cellspacing="0" cellpadding="3">
            <!-- email -->
            <tbody>
                <tr>
                    <th>Email</th>
                    <td align="left">
                        <input class="wpcf7-form-control wpcf7-text wpcf7-email wpcf7-validates-as-required wpcf7-validates-as-email" name="ne" required="" size="30" type="email" />
                    </td>
                </tr>
                <tr>
                    <td>
                        <input class="wpcf7-form-control wpcf7-submit" type="submit" value="" />
                    </td>
                </tr>
            </tbody>
        </table>
    </form>
</div>