Create login popup for Membership 2 using Popup plugin

I want to create login popup for Membership 2 login using Popup plugin.

I try to follow this instruction:
https://premium.wpmudev.org/forums/topic/membership-2-pro-setup-adding-a-login-popup-to-the-menu

But the popup won't sign in though it just refreshes. You can see my site URL in chat. The login link for the popup on the top menu

Is this something you can help with?

Thank you

Plugins/theme involved: Membership, POP UP

Plugin conflict test performed? Yes.

Were you able to replicate the issue? Yes. (Staff reproduced on their site)