Hello,
Please check this example https://prnt.sc/rk27ch https://xstore.8theme.com/demos/sushi/
You need to create a static block with the desired content http://prntscr.com/rk28u7 http://prntscr.com/rk28zf https://xstore.helpscoutdocs.com/article/101-wpbakery-page-builder https://xstore.helpscoutdocs.com/article/91-mail-chimp-form-custom-styles Then go to Theme Options > Header builder > add Newsletter element to your header content and set settings depends on your needs, for example, http://prntscr.com/rk2b8t http://prntscr.com/rk2be5 http://prntscr.com/rk2bhq http://prntscr.com/rk2bkw http://prntscr.com/rk2bnf
Regards