To make a Popup work on Freeflarum, you have to edit the forum widgets app on Freeflarum.
You can't put your HTML made popup on the top of the page as that will only work on computer.
So move the HTML widget anywhere but the top.
Do this as well as my tutorial how to put something on top of something as your popup can show content from behind otherwise.
When you place your widget in certain places, it can make the popup not display fully. The way around this is to put more content in your HTML box.
