[Grim_]

Then we will need to see at least some code to help, since it is a registration/login error. Simply changing values in a database isn't going to screw everything up completely, unless it's specifically written in the script that if that certain value doesn't equal something else, then don't allow the login.

Maybe you could explain your problem more in depth, because all I've understood so far is that you cannot login or register because you edited a value in a database.