It is possible to change the filename of a free-space profile, but the process is complicated, and it is difficult to "get it right."
You could, however, easily change the page name, which is currently "Stedman Family Cemetery," by editing the Page Name: field near the top of the edit-mode version of the page.
In any event, I think that you might find that you want to rethink the idea of changing the name. It may not be appropriate to add "defunct" to the page name. It is not uncommon for old cemeteries to have been removed (with the remains reinterred elsewhere), and people whose ancestors were interred there may want to document the historical cemetery as it used to be, without any qualifying words in the page name.