Need help to integrate ActiveCampaign forms


I am an Unbounce user for a long time but never needed to use scripts or things outside Unbouce scope.

But now I am facing a problem whenre I should be able to setup a button in a way that when someone clicks, it you open a popup with an ActiveCampaign form.

ActiveCampaign gives me the following code:

<script src="" type="text/javascript" charset="utf-8"></script>

It would be expect to have a button that when clicked, would open the following:

I am looking for some elegant solution, because I would like avoiding insert custom HTML inside another Lightbox. Is there a way to setup this directly?