FindIT uses the Bonjour protocol for discovery, so make sure it is enabled on the router in the System Management > Discovery-Bonjour setting. It is enabled by default, but possibly it was disabled during the initial router configuration.
The second possibility that springs to mind is that Bonjour announcements are restricted to the local subnet, so the PC needs to be on a VLAN that is configured in the router to have Bonjour enabled. So if you are on a different VLAN, that would also explain why you are not seeing the router.
Finally, if you do not see any devices in FindIT, then make sure the FindIT service is running on the PC. This should be running by default, but if it was disabled for any reason, then you won't see anything. This is unlikely to be the problem though.
See how you go checking these thing. There is more troubleshooting that can be done if these don't work, but these are the most likely causes.
Ok, then that tells me that the PC is not seeing any Bonjour advertisements. When you said the switch appeared in FindIT, did you mean you are seeing it there now, and if so, is the switch name black or red? Also, are you attached to the switch via the 192.168.1.x interface, or the 10.x.x.x interface?
If you are not seeing the switch now or it is on the other interface, and if you are attached to the router wirelessly, then one possibility is that the access point is filtering the Bonjour announcements. Many access points have special handling of broadcast and multicast traffic, including Bonjour, and so it is possible that traffic is being blocked. Can you try plugging the PC directly into the RV router and see if it appears?