How to insert a form in PS 1.6.13

Hi

I have a few forms that i need to insert in Prestashop CMS page. I read yourr guide on how to do in in PS and it's via iframe. 

So i copied the given code from Jotform and went to PS, created a new CMS and pasted it but i cannot save it because i got Content error.

I checked on allow ifram in html and its ON.

Any hint or trick on this issue?

Thank you very much

Could you please try with a different iFrame code like the one below: 

      <iframe

        allowtransparency="true"

        src="https://form.jotform.com/FormID"

        frameborder="0"

        style="width:100%;

        height:500px;

        border:none;"

        scrolling="yes">

      </iframe>

Please, replace the "FormID" with your form's ID. Let us know how it goes.