Newsletter preference email. Success page

Hi Klaviyo Community!

I’m stuck on something and hoping someone here could help out or point me to the right tutorial.

In one of my post-purchase email I’m including buttons for people to choose what type /how many emails they would like to receive. I followed Klaviyos help article and for the URL for the button I used: 

{% update_property_link 'emailpreference' 'all' 'redirect_link' %}

I understand that by clicking the button their preferences gets updated and they will be redirected to another page for example a “success!“ page.

I’ve now created a form in klaviyo which looks like a success page.

My question is how can I direct the person to that form? I mean, how/where can I find that forms’ URL to put into the 'redirect_link' part of the button URL?

Thanks in advance :)