How does one export a style sheet?

Adobe Frame 12 help says:

"You can also use style sheets (.css) to manage the styles in the published output. In this case, you can export the current styles to a .css file. You can then open this file in a text or .css editor (such as Adobe Dreamweaver), make changes to the styles in this file and import the file back.

To export and import the style sheet:

1. To export the output styles defined for the current output, click Export . "

OK, so where is this?

Nothing I can find on the menus provide this option displaying regular Frame or XML view.

Also, when I find it, do I need to load the css into Dreamweaver? Shouldn't I be able to use the XML view?