can't change Xmage login details

So I know about 6 months back passwords were reset but I haven't logged on in a while.
Performed a successful update but when logging in I see an error message so I can't get to the screen where I can change login details.
Help much appreciated.
Performed a successful update but when logging in I see an error message so I can't get to the screen where I can change login details.
Help much appreciated.