How to change /edit the menus on the frontpage?

Hello everybody is there a way to change/edit the menu bar within the header section? The image is on onedrive. Just open the link on a new tab if it doesn't show up here. I couldn't find a way in the free version; is there a way in the Pro version? I'm an absolute beginner; so, if this question seems to be a bit odd just let me know ;) Thanks for any hint Michael