nerf

Hi There, How can I change my main sites username? I want it to be my business name but when I set it up I used a different name. There was a 500 server error and it was showing a name other than my business name which looked unprofessional. I'd like to change my username so the /home/myusername looks like: /home/mybusinessname instead and the suffixes of my DB names are changed too. Is this possible? Does it make sense? Thanks