Hello AMARODO,
Thanks for using our theme.
Theme Options > Header builder > Newsletter http://prntscr.com/t2iaae , to disable it, just delete the Newsletter element from the Header content http://prntscr.com/t2iaoi
Here you can find videos about our Header builder – https://www.youtube.com/watch?v=RbdKjQrFnO4&list=PLMqMSqDgPNmDu3kYqh-SAsfUqutW3ohlG
Regards