You will need to open a Dmat account with a DP and apply using https://rights.kfintech.com/ if you are not able to open your Damt account before June 3rd, you still can apply with your folio number in Karvy site. However m, shares allotted will be kept in Karvy suspense account for 6 months for you to open a Dmat account and provide details doe transfer to you. If you don't open Damt account with in 6 months, shares will be sold in market and amount will be credited to you.
How to apply for rights