Hello,

You can modify the registration twice by logging in the candidate portal: https://ssc.nic.in/

Enter your login credentials and login. You can see the "modify registration" tab at the top. Click on it and click on 'edit'. Edit the fields that you want to edit and submit the details. You can modify registration twice. After exhausting all the chance you cannot edit any details. But when you apply for next examination in SSC portal you will again edit the details twice. You can use this opportunity to modify the details.