Dear Sushmita, there are two things to it. You are still in the process of filling in the application form. In such case, as long as you haven't submitted the application form, you can go back and make the necessary changes. But for that option, the application filling process has been closed. The other thing is you have submitted the application form and then realised the mistake in the form. Unfortunately the correction window has been closed and you cannot edit the application form any more. Sorry to disappoint you but there is nothing that can be done at this point in time.