Hi,
I assume you mean user "pou". Password is "abs". If you login into Workdesk as user csu, you will find a tab in the top right called "Documentation". Within this tab you can find a scenario guide, which contains also the users for this scenario.
As said in former post, you have to setup the corresponding data model, database, etc. for this scenario in your local Alfresco system.
To avoid that I would recommend requesting Alfresco Workdesk Contract Management as it comes as easy installable package for your existing Alfresco system.
Especially the Contract Management solution shows a end-to-end case management scenario.