As in win7 I got a super admin account, and a normal working account. When installing win8 I had to enter the username of the administrator (mine), then I created my working account (also mine). To distinguish betrween the 2 I would like to call my administrator account 'administrator'.
How to change the username of the superadministrator?
Allow me to clarify a few points...............
1. the only account that could be nicknamed "superadmin" is the BUILT-IN Administrator. As the name implies, it is included in the operating system. It is not an account you "created ".
You can either enable it or disable it ( as described by another member, Mike ).
You can give it a password or leave it without ( by default it has no password ).
You don't get an option to give it an username.
If you have enabled the built-in admin, it will look like this........** notice there is no name ***
2. When you first installed Win 8, you were told to create an account. That account is your admin account.
It will look like this..... *** notice it has a name and it says Administrator under the name ***
3. You said you had created a "work" account. I would assume that you mean a Standard account, not an admin account.
If so, then it will look like this.......*** notice it has a name but it does not say Administrator ***
Now, if you can do screenshot, would you mind post it to show me what you really want?