You will have to ask them for a copy. If they used Turbo Tax online you need the log in info and password. If they used a desktop program they will have to give you a copy. They should have given you a copy when you filed.
Or request a transcript from the IRS
https://www.irs.gov/individuals/get-transcript
Or get a copy of your return using form 4506
https://www.irs.gov/pub/irs-pdf/f4506.pdf
