Change my email address?

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http://ubuntuforums.org – Hello, My account uses my girl friend's email address, I would like to change it to mine. But few years back I created account by the name 'karan mangat' which uses my email ([email protected]) Hence, it (email) is blocked. So, its a request to the moderator to delete the account by the name 'karan mangat' so that I can use my email. Thanks (Hardware)