Dear aspirant,

For correcting your scanned photo copies, the NEET authorities must notify you to do so. You can't just change scanned photo copies on your own. The NTA authority will notify you about that to your registered phone number and email id. Only than you can change photo copies. The correction window will be eligible from 15th Jan to 31st Jan. During that time period only you can change photo copies after being notified to do so with a link to the NEET correction window site.

Hope you got your answer!