how to reset the password in Oracle 11g Express Edition

Have Oracle 11g Express Edition installed on my private laptop  machine. The password has expired. I use SQL developer to connect ...but don't find any way of resetting the password. I am unable to start sqlplus as the machine says('sqlplus' unknown command. and am not sure how to start database from 'run Sql Command line '. Please tell me how to reset the password.

TNS Entry is :
XE =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = Tritonia)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = XE)
    )
  )
Code snippet from
SQL*Plus: Release 11.2.0.2.0 Production on Thu Oct 6 01:50:39 2016

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

SQL> system
SP2-0042: unknown command "system" - rest of line ignored.
SQL> select * from dual;
SP2-0640: Not connected
SQL> select * from dual;
SP2-0640: Not connected
SQL> startup
ORA-01031: insufficient privileges
SQL>

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Flex TronDeveloperAsked:
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Alexander Eßer [Alex140181]Connect With a Mentor Software DeveloperCommented:
- connect to DB via
 sqlplus / as sysdba

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- then change password with
alter user <username> identified by <new password>;

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slightwv (䄆 Netminder) Commented:
Alex provided the syntax on how to reset a password.

>>SP2-0042: unknown command "system" - rest of line ignored.

I wanted to comment on this line.  Once you are in sqlplus, to connect as a different user you need the connect command:
SQL> connect system

Note:  sqlplus commands can be shortened to their first 4 characters so this is also valid:
SQL> conn system
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Flex TronDeveloperAuthor Commented:
Works like a charm. Danke !
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Alexander Eßer [Alex140181]Software DeveloperCommented:
You're welcome ;-)
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