In Hosts menu, if you click Port Discovery after selecting some host or you right click any of the host entry and click Port Discovery, application starts discovering ports of that particular host.
Figure 1: Port Discovery
After the ports are discovered you can add monitors by clicking the Add Monitors button, this takes you to the advanced configuration interface.
Figure 2: Port Discovery
Ports discovered are displayed with their numbers, descriptions, time and type of monitors running. Details button can be used to Hide/Unhide the details.
If you click on Add Monitors button, it takes you to the advanced configuration options interface for the host.