From the list of Parent Accounts click on the blue arrow icon next to the Parent Account 1010 with the Description of "Money In or Out."
This will display your available payment types. Click the Pencil Icon next to the payment type you wish to enable rounding on.
Clicking the Pencil Icon will display the Edit Account window.
At the bottom of this window you will see the option to select Rounding.
Presently the software has the option to round to the nearest Nickel or the nearest Dime.