We congratulate your daughter for acing SAT Subject Test with the perfect score.
You have to send your SAT Subject Test scores to NITK Surathkal as NITK Surathkal is conducting DASA this year.

That is, you have to send you SAT Subject Test scores to the NIT Surathkal through College Board website. College Board allots every college a specific institution code to make the admission process easy.
So, send your SAT Subject Tests scores to the NITK via College Board website. it would help you a ton.

If we talk about college selection, this is to be done during the registration process of DASA. You have to register for DASA at https://www.dasanit.org/.