Somehow this was a long thread that got "cut off".
Basically, this application is a graphical editor for the Tennis Elbow/Tennis Elbow Manager configuration files (players.atp.ini, tour.atp.ini, etc).
I think it's easier than manually changing the configuration file.
First of all, when you open the application, you can select whether you want to edit the ATP or WTA files.
Next, you have to select the directory where your Tennis Elbow/Tennis Elbow Manager game is installed, through the "Select Path" button.
Ex: C:\Program Files\Managames\Tennis Elbow
The program will then load the configuration files from the Data subdirectory (Ex: C:\Program Files\Managames\Tennis Elbow\Data).
On the left side of the new window, you have a list of all the players/tournaments. Just double-click the ones you want to edit, and change the values.
Save the files through the "Save" option, under "File".
And you're done!
If you have any more questions, just ask!