When I signed up for a hosting account Voda Host gave me a default username and password. I know how to change the password in cpanel, but how do I change the username.

Also, in the email, the main account is set as the default username@ my domain. And, whenever I try to login using another account (using Horde) it logs me in to only the main account. Is there a way to change the main account to another account?

Thanks