Warning: Undefined array key "userName" in C:\xampp\htdocs\gdps\tools\account\changeUsername.php on line 6

Warning: Undefined array key "newusr" in C:\xampp\htdocs\gdps\tools\account\changeUsername.php on line 7

Warning: Undefined array key "password" in C:\xampp\htdocs\gdps\tools\account\changeUsername.php on line 8

Old username:
New username:
Password: