Just can't get the popup to pop up!

I've been struggling with this for several hours. The scaffolding hasn't worked well for me, so I've had to create a popup manually. I've followed advice seen on various pages but the popup is created as a normal webpage, no matter what I do.
What could I be missing?
I've attached a couple of screenshots.
Hi Claus,

Watch the online training video! :)
You can also read the reference help page about it. 

I finally figured it out after hours of struggling. The Popup_Editor has to be dragged to the entity field in the second row of the column and not the top row. If it is dragged to the top row, the popup will not pop up but show up as a normal screen. Perhaps you should add this as a tip to the help docs and save someone else a lot of time...