You can view/edit additional self defined Pension settings under Pension button in the Tasking zone. Please follow the below Road Map:

Road Map - To view/edit additional self defined Pension settings
Pension -> Auto Enrolment Pension(AE)Setup -> Select the Pension Provider -> Additional AE Pension settings Link -> Click view/edit Link -> Click Edit button -> Save button.
('Pension' is the button positioned in the tasking zone menu at the top. It is the third button from the Right)