Hello Heping
I’m not quite sure what you are asking. If you want to know how to configure a device within the PNETLab environment, take a look at their documentation page, under the section “Working with PNETLab” on the left menu. I you want to know how to create network addressing on the routers that you have created in the topology, then you can follow the instructions in the lesson that show you the command line commands to use to assign IP addresses to the interfaces. If this is not answering your specific question, can you clarify what it is you are asking?
I hope this has been helpful!
Laz