This brings up a dialog to name the network. Typically you enter a descriptive name, such as Remote_IO or something similar.
A NrioNetwork named NrioNetwork (or whatever you named it), is under your Drivers folder.
Port Name and Trunk values as needed. For example, for the onboard RS-485 port of an M2M JACE, set Port Name to COM2 and Trunk to 2.
If necessary, add, configure, and save any additional NrioNetwork needed in a similar fashion.