Retirement tax questions

No.  What section?  In Deductions?  No.  A 401K only is entered from the W2 nowhere else.  It has already been deducted from your wages in box 1 and you can't deduct it again.  Notice that box 1 is less than boxes 3&5.  Anything you contributed in 2024 will be on your 2024 W2, next year.  

But I'm not sure if you can contribute to a IRA or ROTH IRA at work.  Could it be a ROTH 401K?