PG_STANDBY ISSUE

Hi experts -

I am running into issue with pg_standby. May be my
understanding is not correct. Please help. here is what I did .

1. I made changes in the postgresql.conf ( archive_mode = on
,archive_command = 'cp -i %p /opt/postgres/archive/%f' , archive_timeout =
60s )
2. pg_ctl start -D $PGDATA -l /opt/postgres/logfile
3. postgres=# select pg_start_backup('BKP_LBL');
4. I have done the base backup and I have used the following command
for restore in the recovery.conf
5. restore_command = 'pg_standby -d -s 3 -t
/tmp/pg_standby.trigger.5432 /opt/postgres/archive/%f %p %r'
6. postgres=# select pg_stop_backup();
7. Now I have made some changes to the master database and I waited for
30 minutes
8. I have stopped the master database
9. I have started the slave. But I did not find the changes I have done
after I issued the command elect pg_stop_backup();
10. The log files have shipped to archive folder

Is there some thing wrong with the I am doing the procedure. Please help

Regards