Yeah - don't bother. The UASD does not support the web service, and if memory serves, me someone tried the Excel import trick, and it didn't work. You already have a premium subscription, so you'd be far and away better off by using FreeScan or BCTool. Both are freeware programs, have much more functionality than the UASD (FreeScan in particular, since it supports many of the newer firmware capabilities - BCTool doesn't, yet), and talks to the web service.
We host the user guide for FreeScan in our wiki. If you are looking to load up some Maryland or DC stuff, I think we can help with that. Links to follow....73 Mike
http://scannow.org
FreeScan - This page also has the support forums
http://wiki.radioreference.com/index.php/FreeScan_User_Guide
FreeScan user guide
http://www.bctool.org/
BCTool website - be sure to get the beta version if you use it
http://groups.yahoo.com/group/bctool/
BCTool support