Which version of PRPC are you using. OOTB PRPC provides DMSample application and it will have sample Projects and templates on using PAD.
It will also have the examples of using PAD. Here you refer the scoring example.
If you are using PRPC7 You can login the application using admin role. You can see the switch application for the DMSample. From here you can launch the PAD7. To open the scoring example password is pega