Open the PhonePe app
Tap your profile icon
Go to Bank Accounts or Payment Methods
Select the bank account you want to remove or change
Tap Remove or Unlink if available
Add the new bank account by tapping Add Bank Account
Choose your bank from the list
Verify the account using your registered mobile number
Enter the OTP received from your bank
Set the new account as default if needed
Confirm the new bank account is active in PhonePe