The company that developed Computer Age Dentist doesn't appear to be available anymore. I tried to obtain official support, but it was impossible which means you will have to consult the built-in manual/documentation.
You can either do it using Help > Contents, but you have to launch the software first or access the installation directory. You'll find the documentation as CHM or PDF file format.
On a side note, access Help > About and use the information you find to get in touch with th developers.
