A username is a vital piece of your hosting account. Despite the name, whether or not it can be changed depends on the type of hosting plan you have. Please refer to your hosting type below to understand how your username can or cannot be changed.
Unfortunately, you may not change the user name associated with your control panel. Once it is set, there are vital components using that name. Some of those settings are used by your web site, and are not controlled by Light Space Technologies.
You may change the user names for any accounts you create by going to WHM and clicking the Modify Account link (read more in the related article). However, you cannot change the user name you picked during sign up.
VPS and Dedicated
You may change the user names for any accounts you create by going to WHM and clicking the Modify Account link (read more in the related article). However, you cannot change the user name provided by Loight Space Technologies; Linux is always root, and Windows is always admin.
There Must Be a Way to Change My Signup Username
The only solution Light Space Technologies can offer is to terminate the hosting account, and then recreate it with the desired user name.
For details on how to do that, please read the "Reset Everything" section of the article on how to restore an account from the beginning with the original setup. Once the new account is created with the new username, you would need to re-upload all your content and re-setup the account.