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

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

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

Enter the new address, upload a document for verification, and submit the request. We will first update your dashboard, then also update the KYC and the mutual fund folios in which you have invested (if any).