There you will see current configuration file. Notice how it must be in the same root directory as the main program's *.exe file. This cannot be changed. The Configurator automatically saves all dependencies neatly into the directory "Content" which contains images, functions, and fonts. Copy the file you saved previously to this location. Since the file will have the same name, either rename the current configuration file first, or archive it as a backup. The new file will overwrite it.
Alternatively, you can save the confguration file directly from the Configurator to this location and it will overwrite the current file saving you trouble of copying the file.