Shared
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 us.
Reseller
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.
There must be a way to change my signup username.
The only solution we can offer is to terminate the hosting account, and then recreate it with the desired user name.
WARNING: Accepting this solution will erase all web site content, emails, databases, and everything you have done on the server so far.
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.
Note: Unfortunately it is not possible to directly transfer the contents of the old account to the new account, because too many things (like database names, and certain script configuration files) would all still refer to the old username, breaking most scripts. If you decide to request our transfer services in this case, we may have to quote extra fees for reconfiguration and coding changes.