I noticed you had API key version in the Off position. That is for the older 2.5 versions of the API.
If you just created your account and got a new API Key, then you have the 3.0 version. It will not work with the switch in the off position for the newer accounts. Also, if that is the case, you also had to put credit card information. As long as you do not go over 1000 calls per day (Just do not poll at more than ~once every two minutes - You have it set to once per 5 minutes right now if I am reading it correctly), then you do not get charged. However, they require the credit card information in case you do (You can always set a limit on your account at 999 to ensure that you do not).
More info in this thread here: [RELEASE] Weather-Display With OWM-Alerts Forecast Driver - #111 by Matthew
