How to embed Mailerlite signup form in Figma presentation?

Hey everyone, I’ve created a presentation in Figma. In the last slide, I want to let people sign up for my newsletter. I use Mailerlite for my email, and created a signup form in there. Mailerlite allow me to embed the form using html or javascript. Or they provide a URL to the form.

I’ve tried to embed this form in the slide, but without any luck. Has anyone had success embedding a signup form in a slide?

Thanks! Mark