Hey,

As you have not filled your category at the time of form filling so you can't do much about that. You should have filled the form correctly as it's clearly mentioned that the details once filled cannot be edited completely.

I will suggest you to call the admission authorities at their contact number. They can only help you with this now.

Otherwise you will have to Reregister at the website and fill the form again.

Hope that helps.

Thank you.