If you want to change the username then you should adjust the arg.php the database data. The code you need to change can be found in chat frei / arg.php from line 182
/ * If you are Using database table to store user details * /
user $ table = 'users', / / specifies the name of the table in your All which user information is stored.
$ row_username = 'usrname', / / specifies the name of the field in All which the user's name / display name is stored.
$ row_userid = 'id', / / specifies the name of the field in All which the user's ID is stored (Usually id or userid)
If you have no first name field, then you will need to create this in your user database.
If you want to change the username then you should adjust the arg.php the database data. The code you need to change can be found in chat frei / arg.php from line 182
/ * If you are Using database table to store user details * /
user $ table = 'users', / / specifies the name of the table in your All which user information is stored.
$ row_username = 'usrname', / / specifies the name of the field in All which the user's name / display name is stored.
$ row_userid = 'id', / / specifies the name of the field in All which the user's ID is stored (Usually id or userid)
If you have no first name field, then you will need to create this in your user database.