To find the details of the users in your DB, execute the following statement:
select username, account_status, expiry_date, lock_date from dba_users;
To unlock the account, execute the following:
alter user se account unlock;
To change the password, execute following:
alter user se identified by sepm;
NOTE: Old and new password can be same.
Default port after installation in oracle is 8080; You can check and change it it by doing the following on the command prompt:
Oracle Database 10g Express Edition Release 10.2.0.1.0 - Production
SQL>select dbms_xdb.gethttpport as "httpport" from DUAL;
Change the port:
SQL> select dbms_xdb.gethttpport as "httpport" from dual;
There you go! cheers!