Registered and working
For those that need the help: register at the wunderground.com site. Once you have verified your account, "purchase" for 0 dollars, the developer access. Once you do that you will see your key. Copy that key. Open the Vera device web page and click on the Devices tab on the top row. Then edit the World Weather device (if you have not renamed it yet). In the provider key section, paste it there and click Set. I had to refresh my page and I overridden my location with my zipcode. I set my polling to 3600 seconds but you might not have to do all that. I went into the high temp sensor and clicked poll now and all the values showed immediately.