Set your Search Folders
Whilst not strictly necessary at this point TV Rename needs to know where to look for new files to move to the library when adding new episodes, so lets do it now.
In Options>Preferences, go to the Search Folders tab and
Add the locations you normally use for new episodes.
For example: I have two entries here, one points to my Downloads folder for stuff I get from the internet. The other points to my Desktop which I use as a target when ripping from my DVD collection.