Please give your copy of Aadhaar letter with your bank account number written on it or copy of your bank passbook. The bank may require you to fill a form as well. Updating your mobile number in bank is also advisable. This will send out SMS alerts when you get DBT in account or you transact on your account. Please note that the bank account which has been seeded last with the Aadhaar number will be the one to receive money through DBT.
Aadhaar a UIDAI project to issue a unique Aadhaar 12 digit number to every citizen of India printed on their respective Aadhaar Card. A noob person can easily get familier with all the process about Aadhaar Card in this blog, every answers which you are searching related to Aadhaar Card you will find it here.