If you withdrew your retirement money in 2017, you will get a Form 1099-R and you MUST enter it on your income tax return. The IRS matches the 1099-R forms they receive versus your income tax return. If you don't show it on your income tax return, you will get a letter, generally with taxes you owe and penalties/interest.
You may be able to get your 1099-R online. Otherwise, contact the bank/employer/financial institution to see where your 1099-R is.
If you withdrew the money in 2018, you do not report that on your 2017 income tax return. You will report it on your 2018 income tax return.
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