Atom-material-ui cant change font

Hello
today i have installed Atom /total newbie/
UI Theme: atom-material-ui
Syntax theme: Atom dark

  • instaled package fonts
    os: pc windows 10

I want to change font type /to fira code/ + colour in text file but it dont go
i tried:
settings - editor - font family pt monospace or fira code
packages - fonts - open font selector
but nothing happens
i´m doing something wrong but don´t know what

This setting only changes the editor font, not the fonts in other parts of the UI. To do that, you need to override the fonts in your user stylesheet.