You can use header banner section for these purposes.
1) Go to Theme Options > Header > Header banner position > Above header http://prntscr.com/o61lhu
2) Go to Appearance > Widgets > Add the Revolution slider widget to Header banner area and choose for home page only if you want to show it for the home page only http://prntscr.com/o61m4h
In this case either disable the fixed menu in global option or hide for the home page only.
Also, I would recommend you to decrease the height of the fullscreen slider taking into account height of the header http://prntscr.com/o6iuj7