Download and open the Indian Bank mobile banking app
Register or log in with your customer details
Go to the MPIN or Set MPIN option
Enter your debit card details or other required verification details
Receive and enter the OTP sent to your registered mobile number
Create a new MPIN of your choice
Confirm the MPIN by entering it again
Submit to activate the MPIN
Use the new MPIN to log in to the app or authorize transactions