An IRS Form 1040X is Only used to change a tax return that has already been filed and accepted by the IRS. You do not use a Form 1040X for 2014 if you have never filed a 2014 Federal Tax Return.
TurboTax does not support tax year 2014
You can get free federal tax forms, schedules and instructions from this website - https://apps.irs.gov/app/picklist/list/priorFormPublication.html
If you file a 2014 tax return for a tax refund, the refund will not be paid. The 2014 tax return with a tax refund had to be filed on or before April 15, 2018.
If you have taxes owed on the 2014 tax return then the return can be filed at any time.
