messed up users in Lion

a couple of days ago I replaced my old G4 iMac with a Mac mini. moving from Tiger to Lion OS. Unfortunately for me, I'm one of those people who tends to blunder into trying things w/o reading about how to do it. In the process of trying to get the users set up as I wanted them, I decided to change the name of the one user account on the computer. Now when the computer starts up/waked up, all that shows is the former user name but it will no longer accept the password I set up for that account under the old name. After investingating, I suspect my big mistake was changing the name of the account w/o also changing the name of the home directory, though I don't know for certain.

Anyway, I know there must be SOME way of logging in to the system so I can fix my mistake, but I'm having no luck in figuring out how to do it. Can anyone tell me what to do?

You need this: Mac OS X: How to start up in single-user or verbose mode

Once in single user mode, go ahead and go about trying to fix your mistake by renaming directories and what have you..

Good luck..

thanks, Raz0rEdge, but that route turned out to be beyond my capabilities. Then I realized I actually have a NEW computer so I can call AppleCare and amazingly enough they got me working again.