[RESOLVED] 403 Forbidden error when trying to save a custom hardcoded form

I tried to add this code to the Form Customization Form 1 field (http://emergencyadapters.io/wp-admin/admin.php?page=newsletter_subscription_forms), but I get a “403 Forbidden.
A potentially unsafe operation has been detected in your request to this site.”

<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 class=”newsletter newsletter-subscription”>
<form method=”post” action=”http://emergencyadapters.io/?na=s&#8221; onsubmit=”return newsletter_check(this)” _lpchecked=”1″>

<input type=”hidden” name=”nr” value=”page”>
<table cellspacing=”0″ cellpadding=”3″ border=”0″>

<!– email –>
<tbody>
<tr>
<th>Email</th>
<td align=”left”>
<input class=”newsletter-email” type=”email” name=”ne” size=”30″ required=””>
</td>
</tr>

<tr>
<td colspan=”2″ class=”newsletter-td-submit”>
<input class=”newsletter-submit” type=”submit” value=”Subscribe”>
</td>
</tr>

</tbody>
</table>
</form>
</div>

I thought it might be due to the Wordfence plugin, so I disabled it. I still got the error, so I checked my .htaccess file. Here’s what’s in it:

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ – [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

Not sure what’s going on here…