Need to turn a Select SQL into an update

I have the code below that selects a record based on a nested statement. I need to update the output record ps_job.elig_config4 with the value  returned in the sub-select ps_job.elig_config4

SELECT tr_job_chg_id,
                 emplid,
                 action_dt_ss,
                 EFFSEQ,
                 TR_OFF_TITL_CHG
    FROM ps_tr_job_chg_tbl A
        WHERE A.TR_OFF_TITL_CHG <> 'Y' and a.TR_JOB_CHG_ACTION ='U'
          AND (a.emplid, a.action_dt_ss, a.effseq) in
          (select b.emplid , b.effdt, b.effseq from ps_job b where
a.emplid = b.emplid and a.action_dt_ss = b.effdt and a.effseq = b.effseq
           and b.ELIG_CONFIG4 = ' ') and exists
(SELECT  emplid,
                        effdt,
                        EFFSEQ,
                        ELIG_CONFIG4 FROM PS_JOB C
                       WHERE C.emplid = a.emplid
                         AND C.ELIG_CONFIG4 <> ' '
                         AND c.effdt = (SELECT MAX(ED.EFFDT) FROM
PS_JOB ED
                                           WHERE ED.EMPLID = c.EMPLID
                                             AND ED.EMPL_RCD =
c.EMPL_RCD
                                             AND ED.EFFDT <
a.action_dt_ss)
                                             AND c.EFFSEQ = (SELECT
MAX(ES.EFFSEQ) FROM PS_JOB ES
                                                                  WHERE
ES.EMPLID = c.EMPLID
 
AND ES.EMPL_RCD = c.EMPL_RCD
 
AND ES.EFFDT = c.EFFDT))

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