Pop Up not showing with Ultimate Members

Hi guys, I have a problem.
In my website, I have some pages that a visitor can see just if he/she is logged in. I want the pop-up appear when a user is not logged in as a reminder to login.
I put my popup URL on Ultimate Members – in settings if someone is no logged in, but it doesn’t work!

I don’t know how to go on.
Can you help me?

I put here the link of my page, but it is still under construction.

Thank you in advance!!!

The page I need help with: [log in to see the link]