Easiest way to find a particular navigation phrase is to use "Search phrases". Set the title to search for as "nav." and the text to search for as the current text of the phrase, e.g. "Resources".
That should give you a few results, but should be fairly clear which the right one is.
Another way to find it is by knowing the name of the phrase. The name of the phrase is always nav.
followed by the navigation ID of the entry, which in this case is xfrm
. So the name of the phrase is nav.xfrm
.