Hold on, let me put that all in one so it's a bit more clear. :3
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If you hate your username, you have to live with it. But you can change it if you create a new account, yay!
But only problem..
Registration is closed.
"But when does it open? :C"
It opens at random times for 2 hours straight. But usually, it opens at around the following times:
12:00 PM
1:00 AM
12:00 AM
Now, when you create another account you have to use another valid and working Email address, because if you try to reuse your first one then it'll decline.