Is this possible?
Create a second admin account and use that to rename the first.
Is that the only way?
Alternatives would be to edit the code or the database. Neither of which are recommended.
Why not?
Because most people do not know what they are doing.
Why do you need to change the admin username?
I don't like the one that I registered. But could I make a new one and delete this one? And what would happen to the files?
Don't delete the old account!
Just figured it out :D I entered with the other admin account and it let me change the user name.
Thanks anyway :)