A 401k is a retirement plan that you contribute through your employer via payroll deductions. These contributions are listed on your W-2 form in box 12, code D. Entry of your W-2 form is all you need to enter for your 401k contributions.
If you took distributions from your 401k, then that would be reported on a 1099-R form. This form is entered with its Box 7 code.
https://ttlc.intuit.com/questions/1899457-what-do-the-letter-codes-in-box-12-of-my-w-2-mean
https://ttlc.intuit.com/questions/2562809-what-do-all-the-codes-in-box-7-of-the-1099-r-mean
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