all the threads above were wrong; as a matter of fact, the correct response was published somewhere before on a Quickbooks members discussion group

or online version:

Step 1: on the left side menu, go to NEW, PAY BILLS

Step 2: then, go up to THE GEAR at upper right, and now see bill pay settings

Step 3:  then click on VENDORS and only vendors

Step 4:  then chose PAYMENT METHODS

Step5 : carefully choose to enter or change the payment method i.e., add ACH or other methods

That's it your done....