If you have not received form W-2 you must request a copy from your employer in order to file your return. If your employer will not provide you with your W2 you will have to file your return by mail accompanied by Form 4852. Form 4852 is a substitute to a W2.
Below is an FAQ with instructions on preparing your return on TurboTax to file with Form 4852. Additionally the link to the IRS provides you with a link to the Form and information regarding this filing. https://www.irs.gov/uac/newsroom/missing-your-w2-here-is-what-to-do
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