You can login to your SDN account at www.sdn.sg and update your personal particulars (e.g. email, address, contact number, etc.) under "My Profile". Please follow the steps below.
Go to www.sdn.sg.
Click on the "Sign Up / Login" button at the top-right of the homepage.
Click on the "Singpass" button.
Key in your Singpass details to log in to your SDN website account.
Upon successful log-in, you will be redirected to your SDN website account.
You can edit your particulars under the "My Profile" tab.
Click on the "Submit" button after you have completed your changes.