How to change the password of CTXYS, ODM and MGDSYS users for Oracle EBS 12.1.2

MGDSYS:-

 alter user <SCHEMA> identified by <NEW_PASSWORD>; 

CTXSYS and ODM:-

FNDCPASS APPS/<apps_pwd> 0 Y SYSTEM/<system_pwd> ORACLE <schema> <new_pwd> 

After use FNDCPASS it's recommended to run autoconfig.