Help linking navigation element on homepage to external site

Site URL: http://www.islandgecko-grill.com/

Hi all, not sure if this question even belongs here, but here goes. I am working on redoing a website and I want to link a navigation element on my home page to an external link rather than creating an entire page for it and I have found no easy way to do this. I'm not sure if it's even possible, or if I am just missing something.The string "Order" in the attached screenshot is what I am looking to link.  Do I maybe need to put this in the top nav bar to accomplish this? Any suggestions are much appreciated!!

Can you share link to page in screenshot? And which plan do/will you use?