Total newbie question

[macgirl]

I'm running Subsonic on a Mac. I followed the instructions to set up iSub for my iPhone, starting with the Subsonic interface. When I changed the username and password and hit save, it took me back to the beginning and asked for my login details. When I entered my new username and password a message in red appears saying: "wrong username or password"
I tried admin again, but that didn't work either. I tried logging in through both safari and firefox. I even uninstalled and reinstalled subsonic. Nothing works.

I'm effectively "locked out"

Help!