Open menu by tapping on the icon at top right corner of the screen.
Go to "Bank Accounts" section. All your bank accounts linked with PhonePe will be shown in this section
Select the bank account for which you want to set a UPI Pin. You will see a "SET" option in case you have never set a UPI Pin for the bank account. Otherwise you will see a "RESET" option to set a new UPI Pin for the bank account
Enter the " Last six digits " and "Expiry date" of your Debit/ATM card . Incase your card does not have an expiry date, then try entering "00/49"
You will receive an OTP from your bank. In the next screen, enter the OTP received from your bank and the new UPI Pin you want to set for the account and click submit.
You have successfully set a UPI Pin for your bank account. You can now send money and make payments directly from your bank account in the PhonePe app by authenticating using your UPI Pin