if you have an iOS (iPhone, iPad, etc.) or Android device you can change your Origin ID/username by following these steps:
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install and run EA's SCRABBLE (free) app for iOS http://itunes.apple.com/ca/app/scrabble-free/id408492483 or Android https://market.android.com/details?id=ca.jamdat.flight.scrabblefree
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login to your existing Origin account
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click the gear icon (settings) in the bottom left corner
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click "Edit Account"
credits to Warmain for the info and JifferRiffic for the visual