help about controlpanel

help please i wanna edit my char my char have 4 letters asdd but controlpanel giving error

The new character's name is not just letters and numbers or is shorter than 6 characters or longer than 12 characters..

what i must do help pls

You can either modify the control panel's php script where it limits the characters from 6 - 12 to allow less or you can modify the name in the DB directly using enterprise manager.