Now that JanesFile.txt has been copied from JanesFolder to JanesOtherFolder it is ready to be renamed as something else.
In one of the navigation views, select JanesFile.txt in JanesOtherFolder.
From the file's context menu, select Rename.
The navigation view overlays the file's name with a text field. Type in JanesText.txt and press Enter.
To halt the renaming of a resource, Escape can be pressed to dismiss the text field.
Copy and rename works on folders as well.
In one of the navigation views, select the folder JanesOtherFolder.
From the folder's context menu choose Rename.