Microsoft Windows [Version 10.0.10586]
(c) 2015 Microsoft Corporation. All rights reserved.

C:UsersJong>cd c:/oraclexe/apex/

c:oraclexeapex>sqlplus / as sysdba

SQL*Plus: Release Production on Fri Aug 26 09:42:30 2016

Copyright (c) 1982, 2014, Oracle.  All rights reserved.

Connected to:
Oracle Database 11g Express Edition Release - 64bit Production

SQL> start apxchpwd
This script can be used to change the password of an Application Express
instance administrator. If the user does not yet exist, a user record will be
Enter the administrator's username [ADMIN] admin
User "admin" exists.
Enter admin's email [admin]
Enter admin's password []
Changed password of instance administrator ADMIN.