You can't use TurboTax Online to do a previous year's return. You'd have to purchase the previous year's CD/Download version of TT, which you can do here: https://turbotax.intuit.com/personal-taxes/past-years-products/
Alternatively, you could download the 2014 MD tax forms and prepare them manually. The forms can be found here: http://taxes.marylandtaxes.com/Individual_Taxes/General_Information/Individual_Tax_Forms_and_Instruc...
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
