Switching between weather stations

Hello and thank you for your effort to provide this widget.  I own a psw and love it having it real time on my garmin watch.  

question:

when on settings there are two WU STATION ID fields.

whats the difference?  Do I need to input the same Id in both?  Or is it in case I have a second psw therefore a second id that I could input it as well?  

in addition,  how do I enable multiple locations, rather than my own psw?  

many thanks