Along the left find Misc Info/Direct Deposit > Direct Deposit of Refund/Electronic Payment > Check the box for Electronic payment of balance due, then put the amount to pay in the next box

You also need to input the Bank Information, just like for direct deposit.

The next box is electronic payment date?  I do not see an amount option?

Click on "Miscellaneous" near the top of the screen:

You'll then see the box to enter the payment amount:

Found it!  Thank you!