iframe. All you need for this is the URL of the live form.
<iframe frameborder="0" width="100%" src="FORM_URL?embed=1&inline=1" height="HEIGHT"></iframe>
FORM_URLwith the full URL to the form (don’t forget the
FORM_URLwith your actual form's URL, including the
HEIGHTwith the desired height of the form, in pixels .
If the form is taller than the height you specify, the form will scroll inside the
iframe. Otherwise, it will sit neatly on the page.
If you're unsure which height you'll need, try
height="400" to get started. You can always size up or down later once you see what it looks and feels like when embedded.
There are some downsides to using an