How do I create not personalized Join URL

Hi.

I will hold a webinar for outsiders.

So  I create a Pardot form for outsiders.

(My GoToWebinar account connetc to my Pardot account.)

And some insiders wanna watch the webinar.

I don't wanna insiders to submit the form.

Beacause I don't want to mix outsiders data and insiders data.

So I wanna create not personalized Join URL for insiders.

How do I create not personalized Join URL for insiders?

Thank you.