Add Archetype does not work

Hi, 

I am very unexperienced in working with archetypes, but I watched severyl youtube videos how to add Archetypes if they do not exist in the list. So in my case it would be the javafx archetype on a maven project. I did everything like explained in the video or on the oficial website from javafx but when i press ok nothing happens. I don't have any idea why it shouldn't work...

I also tried other archetypes but it is the same thing with every one of them.

I hope somebody can help me with this problem because I am very frustrated and as I said I'm very new to this stuff so I hope you understood what I meant.