You can change your own forum name, but you have to follow these steps exactly, specially #5 and 6.
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Sign-in to your Corona account via https://developer.coronalabs.com/user
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After login, you should land on your account page
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Click the “Edit” button to the right of the “Account Info” header
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Edit username and “Save”
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Log-out from the top user bar on any Corona site
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Sign in and navigate to the forums, and your username should be updated for the forums immediately.
After you logout and back in, the forums should show your new username.