Website: Top left menu (3 lines on top left) > Service Center > Change Nominee Details.

AppHome page → Menu (bottom right) → Mutual Funds →  Service Center →  Change Nominee Details.

Note: If you have not invested in Stocks & ETFs, then you will be on the Mutual Funds page by default.

Enter the new/updated nominee details and submit the request. We will first update your dashboard and then also update the mutual fund folios in which you have invested (if any).