2017 taxes

No you can't have it deducted from your refund.  You need to pay for 2018 upfront with a credit card to unlock 2017.    Did you already file 2018?  If not, then go though the FILE tab again and unselect pay with refund.  Then to pay the TurboTax online account fees by credit card so you can access your prior year online tax returns, click on Tax Tools on the left side of the online program screen. Then click on Print Center. Then click on Print, save or preview this year's return. On the next page, to pay by credit card, click Pay Now. On the next screen just click on the Continue button. The next screen will show a review of your Fees, click on Continue. Complete the next screen to pay by credit card and click Continue.