I'm trying to find on Turbo tax where I can post contribute to my 401k to reduce my tax obligation for 2022. Normally it asks before ending, but I didn't see it.

[DoninGA]

Your 401(k) contribution to the employer provided tax deferred account are already reported on your W-2 in box 12 with a code of D.  They are not entered anywhere else on a tax return.

[VolvoGirl]

You only enter 401K contributions from your W2, nowhere else.  They have already been deducted from the wages in box 1 and you can't deduct them again.  You can only deduct Traditional IRA contributions.  

[jcooperhagemann]

I didn’t have a 401k in 2022, but the IRS allows a post 2022 contribution before April 18th. Where is it on Turbo tax?

[DoninGA]

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@jcooperhagemann wrote:

I didn’t have a 401k in 2022, but the IRS allows a post 2022 contribution before April 18th. Where is it on Turbo tax?

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If you are an employee and have an employer provided 401(k) the contribution to the account are only made on a calendar year basis.  You cannot contribute to the 401(k) in 2023 and have that contribution reported on a 2022 tax return.