The steps are mentioned on the EBS Setup Guide for 12.2 which can be downloaded from the link : https://docs.oracle.com/cd/E26401_01/doc.122/e22953/T174296T589913.htm (12.2 Setup Guide) under the topic "If the Admin Password of an EBS WebLogic Domain is lost or forgotten"
Also refer for more details :-
Procedure To Restore The Weblogic User Password On EBS 12.2 In Case Of Lost Or Forgotten Password (Doc ID 1949675.1)
Also refer for more details :-
Procedure To Restore The Weblogic User Password On EBS 12.2 In Case Of Lost Or Forgotten Password (Doc ID 1949675.1)