To change the HKUAP password (at least once every 3 months), login the HKUAP system to change your password.
To change the Oracle Discoverer password (at least once every 6 months):-
Login HKU Portal > Type "Change Discoverer Password" in the Search field > Click the link "Change Discoverer Password"
If you forgot your HKUAP password, you can reset your password by completing the form CF141 "Change of Password for Administrative Computer Systems".