To change manul to auto undo management in 9i

Hi
My production database on manul undo management means (RBS) . I want to change this on auto mode Please Help me what steps i follow to do this
DB 9.2 and OS AIX 5.2
Thanks

SQL> alter system set undo_management=manual scope=spfile;
System altered.
SQL> shutdown immediate;
SQL> startup
SQL> show parameter undo
NAME TYPE VALUE
undo_management string MANUAL
undo_retention integer 1800
undo_tablespace string UNDONEW
SQL>
do this same for auto....
regards

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