Where do I post my HSA contributions made through my employer?

[AnnetteB6]

Those are normally reported on your W-2 in box 12 with code W.  

But, if they are not reported there, go to the Deductions and Credits > Medical > 1099-SA, HSA, MSA section of your return to indicate that you have a Health Savings Account (HSA).  Then go through the questions in that section until you see a page titled Did your employer tell you about any other contributions?  Answer 'yes' on that page and you will see an entry for contributions not reported on your W-2.