i have installed oracle xe 11g and i have loged in on storage and apex tabs and i have created workspace and users.
now i would like to access apex internal administration. i need to configure email server ip there
open http://127.0.0.1:8080/apex/apex_admin (or a different hostname, if you did not install on your local machine). The username is "admin", the password will be the same you have for your database system accounts.
that's no problem. You'll find a script named apxchpwd.sql in the apex directory of your XE installation path (e.g. +/u01/app/oracle/product/11.2.0/xe/apex+ on Linux).
Change to that directory, start sqlplus as sysdba and run the script to reset the password.
Note that you'll have to set the environment properly to be able to run sqlplus. You can do that by sourcing the oracle_env.sh
sqlplus sys@XE as sysdba
(enter login data)
(enter new password)
Afterwards you should be able to login using the new password.