@MMourad once you’ve added the code, do you hit save & publish? That’s been my hiccup in the past when using design manager.
For the record, I use the drag & drop editor, not the design tools. And when you have your account and email settings dialed in, your styles should work.
yes I did save and publish I still can’t see my style the preview of the Module I can only see the style when I make the preview live is there something else that I need to do to be abele to see the general styling in the preview of my Module directly ??