form code in an Hero-site

I use SiteOrigin Hero. How can I add a individual form? At the runtime the page has no input tags. But if I open the site in WordPress admin and I edit the code with the SiteOrigin Editor, I see all tags.

This is the HTML code:

<form id="formps" action="http://myserver.de/registration.php" method="POST" name="formps">
<input name="liste" type="hidden" value="1" />
<table border="0">
<tbody>
<tr>
<td align="left">Vorname:</td>
<td align="left"><input name="vorname" size="30" type="Text" value="" /></td>
</tr>
<tr>
<td align="left">Name:</td>
<td align="left"><input name="name" size="30" type="Text" value="" /></td>
</tr>
<tr>
<td align="left">E-Mail:</td>
<td align="left"><input name="email" size="30" type="Text" value="" /></td>
</tr>
<tr>
<td colspan="2" align="center"><input name="anmeldung" type="Submit" value="Senden" /></td>
</tr>
</tbody>
</table>
</form>

In a “normal” WordPress page without SiteOrigin work the code.