Can't change temporary username. Already attempted FAQs

I have a temp username and connected to my facebook. I followed the directions that are listed on the FAQS for creating a permanent username, however when I enter in all my information it rejects my email address everytime. I don’t want my permanent username to be usa_(blah blah blah). Already been driving with it for over a week, and would like to be able to keep my account.

Try this thread (starting with the linked post): http://www.waze.com/forum/viewtopic.php?f=14&t=31834&start=20#p389749