Hello,
1) Edit the Revolution slider grid layout to change the height http://prntscr.com/uly4gu But take into account that if you use full-screen slider type http://prntscr.com/uly5an then height proportionally increased.
2) Remove the black layer http://prntscr.com/uly5yu
3) Go to Theme Options > Header builder > remove the newsletter element or add the content to your newsletter popup http://prntscr.com/uly79n
Regards