The whole process is online. It’s already mentioned above.
How to apply for the Aditya Birla Fashions rights issue?
Once you either receive the REs from the company or purchase it from the market, you will need to apply for the rights shares using Netbanking ASBA. You can check the process in this post .
You can verify your entitlement on the website of the Registrar & Transfer Agent . You will need to enter your demat account’s Beneficiary Owner ID which is a 16-digit number. You can read this FAQ on the RTA’s website for details.