Ahh, I see.
Another thing on the todo list is a nice installer. Lacking that, the app just runs with your local java installation.
In order to manually run the app with parameters, you need to specify the command.
The easiest way to do that, is to make a shortcut to the .jar file.
Then, right click on the short cut, click properties, and go to the Shortcut tab.
In that tab, in the "Target" box, replace what is there with:
javaw -jar weatherlinkWindows.jar notAnIP yourSensorId
If you need to specify an IP address, replace 'notAnIP' with the address. Put the desired sensorID in the second spot.