You will need to complete an amended tax return, Form 1040X, for tax year 2014. Since you paid the CPA to complete your 2014 tax return then they should also complete your amended tax return. An amended tax return can only be printed and mailed to the IRS.
IRS Form 1040X - https://www.irs.gov/pub/irs-pdf/f1040x.pdf
IRS Form 1040X instructions - https://www.irs.gov/pub/irs-pdf/i1040x.pdf
To use the TurboTax software to complete an amended tax return that was not completed using TurboTax can be complex. You would first have to purchase and download the TurboTax 2014 software to be installed on your personal computer. You would then have to exactly recreate the 2014 tax return that was filed to include any errors or mistakes on the return. Then save the return to be printed and mailed to the IRS so the software knows the return has been completed. After that you then can begin the process to amend the tax return.
Go to this TurboTax website to purchase and download one of the 2014 desktop editions - https://turbotax.intuit.com/personal-taxes/past-years-products/
