Changing Username

Hi All,

I just got a new mac and when i was setting it up, i miss typed my username (well to be honest, this is not my mac, its a friends and i am setting it up! So i missed type their username).

I changed the username of the account from the control panel.

I now want to change the user directory name. Can i just change it like any other directory?

And finally, when u want to install something the security warning that comes up and asks for your password, also has the name miss typed. So how do I also change that?

Thanks