Main menu showing active area with single page navigation

Hi, I love Enfold. You’ve done a great job!

I have three questions:
Nr. 1)
I want to build a single page parallax website and I want the main menu to change as you scroll down showing the current active area.
I have added anchors to the different color areas following the indications at http://kriesi.at/documentation/enfold/add-anchors-to-your-page-for-single-page-navigation/
but the main menu still doesn’t show any changes (highlight & underline effect) as I scroll down to the different areas.
Just in case this is relevant: I’m using the homepage as a frontpage as well. Every color area carries the name of one of the main menu items.

Nr. 2)
How do I link the main menu areas so that the go to the color areas in the parallax frontpage/home?

Nr. 3)
I want to add a custom CSS. Where do I find all the CCS style sheets?

Thank you very much for your help!