How to Reconnect a Single Navbar Instance Back to the Global Navbar in My Site Wireframe?

Hii everyone, I have already started working on the wireframe and my site has more than 40 pages, i had the navbar as a global instance, but accidentally I unlinked one page's navbar instance and changed it and now its the only different one, I can't seem to understand how to make add it to the global navbar again so if I change the navbar component it will change on all the pages? Help please