With the ONLINE version the original poster was posting from there is no FORMS mode so in the FILE tab STEP 2 all the options for refunds and balance dues are presented ... first for the feds and then the state. If you have already efiled it is too late to make any changes.
And if you choose to pay the balance due with a debit card (which processes like a Credit card) there is a fee which is clearly posted ... direct debiting from your checking account is free but if you entered the debit card on that account it is NOT free.
SAME THING IS ON THE IRS WEB SITE where the fees are actually a bit cheaper :