If this is done thru the payroll system it is already pre tax so you cannot also deduct it as an adjustment to income on the return. Look at your W-2 box 12 code W represents the HSA contribution you and the employer have already made.
The HSA is handled in 3 parts in the TT program :
https://ttlc.intuit.com/community/health-care/help/what-is-a-health-savings-account-hsa/00/25765
First the contribution:
https://ttlc.intuit.com/community/entering-importing/help/where-do-i-enter-my-hsa-contribution/00/26...
https://turbotax.intuit.com/tax-tips/health-care/what-is-the-irs-form-8889/L8hRNHx4o
Next the limitations screen to confirm you are eligible to make the contributions:
Until you complete the HSA portion of the TurboTax interview to establish your eligibility for an HSA contribution, TurboTax will treat the amount entered on the W-2 form as an excess HSA contribution.
https://ttlc.intuit.com/community/health-care/help/why-am-i-showing-an-excess-hsa-contribution/00/26...
And lastly any distribution:
https://ttlc.intuit.com/community/health-care/help/why-is-my-hsa-distribution-taxable/00/26609
