I was confused because I have another instance of Radarr running on a different computer and I didn't want them to conflict (even though they were running on two different computers....don't try unRAID out for the first time at 2am - whoops!).
Following your instructions, I deleted Radarr, changed the appdata share for a minute so that I could see it in Windows, and deleted the Radarr folder. After reinstalling, Radarr had the same issue so I did the same steps but restarted the array after uninstalling Radarr and it worked!
Thanks for your help and instruction.