The developer of the application has a corporate website that doesn't provide the necessary details in order to print the client list. In this case, you have two options:
Use the built-in documentation available to read how to print the items and the clients. Additionally, use the installation directory and look for CHM, HLP or PDF files.
Contact the developer and ask him about the possibility of printing the client list from the application.
Contact page: http://www.intapp.com/offices