Hi,
Watch this video – https://youtu.be/7QluEYxznKs In your case, enable Elementor for static blocks – http://prntscr.com/10xxpnh , go to Appearance > Menus > click here – http://prntscr.com/10xxq5d and you will find what static block – http://prntscr.com/10xxqnz , go to Static blocks > edit the block using elementor > http://prntscr.com/10xxr4w
Regards