I have a dfas form 705 that says my payment of a debt I pad It says that I should be able to put it as a miscellaneous deduction, where do I put this info in?

it depends. What kind of a debt was it? Most debts paid to the federal government are punitive in nature therefore not deductible but this depends on what type of debt you paid back.

It's deductible as a miscellaneous expense only if it was not subtracted from your W-2 or 1099-R already. See https://ttlc.intuit.com/community/taxes/discussion/i-have-received-a-form-705-from-dfas-the-overpayment-by-department-of-defense-established-as-a-debt/00/110236