accessbit on "How can I modify the top header Menu?"

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I have down loaded your Customizr.
I have little trouble with the Menu.
I do have lots of items to put it on the menu and I want to put a Drop Down Tab based menu. That means I want to put the Menu right below the slider and header, Then I want to put the menu with colored TAB like one that you have on this site where you see in yellow "Showcase (new)" or " in Blue tab "Download Customizr"
Can you please send me an instruction how can I do it?
Also if it is possible to install any other 3rd party Menu feature on Customizr?
Thank you again,
Mark Shariar