"System" user locked

Hello all. For entering in  Oracle 10g Db we start SQLPLUS. user-name "system" and
password  containing @ (my mistake), TNS error view. Presently I know that problem
in "@" symbol. While understood the user "system" is locked....
As possible change password and unlock the user?
Or create the the new user for Oracle....
Please advise ....

ups,
I forgot that part, we are giving the answer in small pieces
Resume for "dummies"
1) Connect to the database
sqlplus "/ as sysdba"
2) Unlock the user ( as  William Fee post )
ALTER USER xxxxx ACCOUNT UNLOCK;
3) Change the password ( as my post )
Alter user system identified by <newpassword> 
4) a bit optional ( IMHO ) change the profile  ( as  William Fee post )
ALTER PROFILE DEFAULT LIMIT FAILED_LOGIN_ATTEMPTS UNLIMITED;

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