Once the driver is installed, you will need to create the connection to the Pentaho Data Service. For many tools, you can connect by specifying a connection object. Review the connection details and options in Connect to the Pentaho Data Service from a Pentaho tool.
You will probably also need the following JDBC driver class parameter and its value:
The JDBC connection string uses the following format:
jdbc:pdi://<Pentaho Server Hostname:Port>/kettle?option=value&option=value
The following example shows how you might format a connection string:
jdbc:pdi://localhost:8080/kettle?webappname=pentaho
The webappname is required if the data service is running on the Pentaho Server.