This post has instructions on changing your username. As for your email, if you created the account by connecting to a google account, then you will either have to change the email associated with the google account, or contact support to see if they can unlink the google account from your forum account. If you are just using an account with an email address, I believe that you can change the email in the same place that you would change your username, but my account is linked to a google one, so I’m not certain.
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