Select File > Settings and choose Software Integration > WFN in the left list.
Enable Pirana support for WFN — When checked, enables editing of the WFN settings.
WFN startup parameters — Parameters for setting up the run environment.
NMBS parameters — NMBS command arguments to execute bootstrap NONMEM runs.
WFN.bat location — Path to the folder containing the WFN.bat file. (Use 
to navigate to the folder.)