The navigation tab in your page settings enables the admin or the co-admin of an Organization to adjust the menu links of the upper horizontal navigation bar. Only organizations have this option to manage the navigation links within the page settings, since only this page type is controlling the menu links.
You can structure your menu by defining main and sublevel links. The link consists of a name and a resource. The resource can be internal residing in JUST SOCIAL (one element, e.g. an document or a list of elements, e.g. a list of documents) or external (e.g. an external website).
Within the navigation tab you can add new menu links, update their name and/or resource, move them by drag & drop and remove them.